(sorry if this is something that's been suggested already - it's tough to keep track of all the comments!)
It seems like there are a couple big hurdles with the current version of Dual Identity, such as:
-5 minutes being a really long time to access a primary class ability
-Losing (nearly) all of your abilities/feats when in Social mode, which also makes a rules nightmare...
What if the Social Identity wasn't actually separate from the Vigilante Identity? After all, when he's playboying it up at a Wayne Foundation fundraiser, Bruce Wayne doesn't stop being Batman - the social persona is a DISGUISE, not an alternate identity (as opposed to the Chymist PRC, which actually ends up being two people).
If Social Identity can be 'equipped' with similar mechanics to putting on armor (including partial benefits for 'donning quickly'), instead of completely losing abilities, the Vigilante loses renown/takes penalties to the social roll for non-subtle use of their abilities (this would make some of the Talents like stealth casting even more helpful).
This would also help the class have a little more functionality at first level.