Eh... I'd say create a macro or two that you can trigger.
Nothing against the idea itself, but I can see it getting irritating rather quickly (especially if some of the costume change emotes are put in) just because you were a second or two slower - thus taking you "out" of combat and "back in." Or multiple times in a mission.
Closest I've seen is a scrapper who swaps to a ginormous costume (same exact costume, just scaled a lot bigger) when using Moment Of Glory.
Unlikely to happen because of the timer in place on costume changes.
The timer is in place because a change of costume is a not insignificant amount of info transferred from client to servers. If you get a lot of people doing it often, it will cause lag.
And going in an out of combat posture would be considered a lot of changes often.
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A more limited option for this is to keybind a SG mode change linked to when you use certain powers. It would at least allow you to change your costume's colors whenever your want (because you can change SG mode at will without any timers involved).
I understand that might not be as "cool" as a full costume change at will, but at least it's doable within the limits of the game. *shrugs*
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Now that we have combat active aura, I hope the devs will consider adding the ability to automatically switch between two costimes when combat begins.
Transformations are a HUGE part of the super hero concept both in the west and the east. I think many people would like to see their character armor up or transforms automatically when they enter combat just as much as auras powering on and off.
Maybe it could be something like a level 40 unlock the way caps and auras are to make it special and keep it from becoming used to frequently if it is resource instensive.
Anyway that is my suggestion, thanks for reading.