For the framing, i would have seen if you get get 1 or 2 actors from each of the other other series to talk about a specific Enterprise character and how they inspired them , trying to give wisdom and inspiration to a cadet to fresh Ensign.
I had to look, but i actually wrote a quick outline about how this would look (written 10 years ago, in 2014!):
Teaser
TOS Crew talking to Cadets/young officers (or just luck Trek fans dressed in as Starfleet officers/cadets, hearing a story)
Switch to TNG talking to a similar group, in their era (in a 10 Forward lounge?)
Switch to DS9 & VOY crew at Quark's talking to cadets
Act 1
Bashir, O'Brien, B'Elanna & Harry relay to cadets some of their heroes
Explain how each made an impact
Phlox Trip & T'Pol do something to help injured people
What causes the injury (Romulans?) sets stage for the ENT story
Act 2
TOS sets up this scene
saying how Supporting crew made a vital contribution to that era
Sato Mayweather & Shran do something to help the Enterprise crew deal with this threat
Mayweather & Sato are AT LEAST a Lt. by this point, if not Lt. Commander
Act 3
Riker & Worf set up stage for Archer uniting the UFP founders
Archer''s actions, along with Reed's expertise, help solve an issue
Closer
TNG, TNG, VOY & DS9 crews talking about Archer helping found the Federation
ENT Last scene w/ Archer (like we saw in Enterprise..except Mayweather gets promoted)
Narrative “These are the voyages…”
said by all Captains