I'm a major advocate of allowing all ships to be playable at endgame.
Although I find myself usually talking about how we need 5th Tier versions of Original Series Starships, we do also need a 5th Tier Akira. I would configure it to have comparable stats to Cryptic's fleet escort.
I'm all for a T5 Akira, and I believe it should follow the example set by the Nebula as a between-class hybrid... in this case, an Escort Cruiser. Classed as an escort by the game, but with more hit points and a lower turn rate than other escorts, a Lt. Commander engineering officer, and a universal Lt. slot like the Nebula.
Special ability: can summon up to three Peregrine-class fighters for support.