Picard talking to a holodeck Kirk: I think that would be perceived like cheating. Especially if the trailer didn't make it crystal clear what was really happening.
Not at all, because the most important thing would be seeing William Shatner and Patrick Stewart finally onscreen together and comparing notes as Kirk and Picard. There would still be a meeting of the two captains and eras.
I can imagine a lot of negative reaction to this from fans.
There's a lot of negative reaction from fans to everything.
As such, there's not going to be a Kirk-meets-Picard scenario that will please everyone. Heck, some didn't like that the two captains met at all and thought that Star Trek VII should have been a TNG-only movie.