Hey, just make the movie from Kirk's perspective, so that we never *see* him, we only hear him.
And any reflection of him, or establishing shot, is done a la Wilson in Home Improvement...
Then everyone is Spartac, erm, Kirk.
Michael James Vog-El. Perhaps if he adjusts his name, it would work. Vog-El suggests a Kryptonian. Who wouldn't want a Kryptonian as Kirk. Superkirk. Yes, that would work.
Seriously, I'm fine with Yelchin, Quinto, and Saldana (whose skin tone isn't that far from Nichols: it's all in how African-Americans are photographed!! Nichelle never looked like she was from the Congo or Central Africa... it's just how the film process worked in the 60's. Anyway....).
McGillion would be great, but it's only an audition... when JJ casts him, then it'll be okay. Urban seems to fit as McCoy.... I can see Urban doing a blooper reel joke as he did for the Caesar Salad... for Mint Juleps... that would be a hoot.
So, for Kirk... just go ahead and get Matt Damon. So what if the actor is "older" than envisioned.... Truth be told, young Kirk is the son of a starfaring family... his brother is canon to that, even if his father's travels are all novel and fanon... can't deny the Kirks were out there... by Jove, anyone recall "Conscience of the King"? How was young Kirk out in space at that age, eh???
So I say, get Matt. Kirk is supposed to be wise beyond his years after all. I'm sure Matt can play that. And cast Scott Bakula as George Kirk. Maybe Archer was Kirk's great-grandfather... heh... so now there's another "excuse" for a so-young Kirk to end up with the namesake Enterprise....