Yes, as long as there's a clearly different style from the Dominion War.
A bit of a long post here.
If the Romulan War ever ended up on screen, I’ve always imagined it being a guerilla warfare in space meets the War on Terror with a bit of WW2:
- drone warfare (Romulan drone ships, meaning thousands of kidnapped Aenar to pilot them), with the Romulans going after anyone would was a part of the Coalition of Planets, regardless if they were an ally (i.e. Tellar Prime) or they were neutral during the war (i.e. Denobula), because of their perceived defensive war against Earth.
- occasional kamikaze attacks on planets by Romulan Birds of-Prey (i.e. Coridan as in
The Good that Men Do, which resulted in billions of deaths).
- Romulan puppet governments (Coridan & Tandar Prime), for the purposes of thefts of starship designs, intelligence gathering, assassinations, and infecting ships and starbases with Romulan subroutines
- Remans taking ships and crews hostage, occasionally reading Rights of Statements before execution, and broadcasting through subspace radio.
- Romulan ships (both ENT & TOS Birds-of-Prey) self destructing to avoid capture from Earth vessels, even when boarded.
- Romulan insurgency (cloaked Romulan mines, Earth convoys frequently ambushed from behind moons or other interstellar bodies after decloaking, masked Reman shock troops boarding cargos ship and frequently overwhelming those crews & their primitive weaponry (think EM-33 or the weapons they had in
Fortunate Son), while MACO troops frequently fall for the trap of fake distress calls of damaged vessels).
- Earth ships (NX class & Freedom class (MACO) offensively, Emmette-type & Intrepid-type defensively) having to deploy photonic torpedoes like mines as a tactic in response, connecting it to something Captain Janeway did on Voyager a few times. This tactic also leads to an eventual depletion of antimatter reserves.
- WMD warfare on the part of the Romulans (biological, chemical, nuclear) through the TOS Birds-of-Prey that forces Earth (both Starfleet & Earth Cargo Authority/Earth Cargo Service) & its recently joined allies (Vulcans, Andorians, Tellarites) to weigh the moral implications of using nukes to help end the war, which is contentious due to WW2, the Eugenics Wars, & the outcome of WW3 and the post-atomic horror. Spatial torpedoes would make a brief return for the Earth ships for this purpose.
- MACO ships like the Franklin are the 22nd century equivalent of the German tank problem in WW2
- Ship weapon upgrades are due to MACO & Andorian cooperation (to explain why they weapons have the colour they do in TOS), transporter upgrades (like how they are in TOS & Discovery) are due to Tellarite cooperation, and Warp 7 ships are due to Vulcan cooperation (& Tobin Dax).
The duration of such a war would have an impact on the human psyche and morality, with early frustrations amongst the human crews going from minor bickering over movie night, writing letters, what they get “paid, ” being drafted into war, and inability to have face to face communications with the Romulans to a behaviour once recognized by Quark:
Quark said:
"
Let me tell you something about Hew-mons, nephew. They're a wonderful, friendly people – as long as their bellies are full and their holosuites are working. But take away their creature comforts… deprive them of food, sleep, sonic showers… put their lives in jeopardy over an extended period of time… and those same friendly, intelligent, wonderful people will become as nasty and violent as the most bloodthirsty Klingon. You don't believe me? Look at those faces, look at their eyes…"
The human crews’ overtime would be:
- forced to go from neutral language like “tactical alert” to embracing aggressive language like “battle stations”.
- engage in infighting, power struggles, and regularly challenging the authority of the commanding officer in front of others.
- emulate behaviors of the NX-01 crew during the Xindi crisis (torture, openly stealing warp coils and other parts from passing ships, and a general lack of mercy).
- emulate behaviours from the Mirror Universe (frequent backstabbing & intrigue, captain’s woman, conquering worlds & laying waste to them, propaganda that the war is going well, corrupt and arrogant, brutal & savage).
- emulation of those behaviours from the Xindi crisis and mirror universe would be rooted in a genuine discomfort of losing people.
- characters like Archer, Shran, Soval, T’Pau, Skon, Captain Stiles and even Section 31 operatives like Harris & Reed, etc would be aware that what is going on among some of the human crews during the war is wrong and that Earth was at significant risk of returning back to the days of the post atomic horror.
- Even the Klingons would take note of both Earth’s and Romulus’ behaviour during the war, although they would be quiet about it in general.
Essentially, they would have both their humanity & 22nd century institutions severely challenged.
I don’t think there is much I can do from the Romulan side of things, other than have the Romulans hint that significant political changes on the basis of morality will occur between the ENT days and TOS days when they next meet after the Battle of Charon (change in military uniform & acceptance of female commanders), and that they embrace the form of mourning used by Nero’s crew. And perhaps they change their stance on Vulcan over the course of the war, from reunification to extermination due to a coup d’état on Romulus.
Overall, aspects of it would be rather dark and un-Star Trek like, but would capture the idea of the war being “a primitive time,” to quote Kirk in
Balance of Terror and would mark a significant divergence from the portrayal of the Dominion War (which was total warfare).
Maybe what I’ve outlined is too dark, maybe even darker that what’s been aired on Star Trek in the past, and turns Star Trek for the duration of this story into a war drama, but it’s just a concept. I don't expect it to be used at all. But this feels like TV-MA to me, even though there are no blood and guts at all.