And as other have mentioned, ditch the TCW. It served no real purpose. I might even go so far as to not have the Klingons in at all.
As for the Romlans slowly fold them into the story muchas DSN did with the Dominion, have the odd reference dropped into the odd episode.
I agree with ditching the TCW and Klingons. They just feel over-used. But keep the S4 Augment arc. I'd rather have had Romulans much earlier and more prominent (but in better uniforms than NEM castoffs
). A female Romulan Commander v Archer/T'Pol might have been an interesting dynamic as well as nod to TOS.