That's going to be nearly impossible. Depending on where you are in MK, you'll be plowing through a lot of people to get to the monorail. I'd say 20-30 minutes just to get out. From there, how many trains will come and go full before getting on one? Then it'll take 10-15 minutes once you're on the monorail before getting to The Poly, then 5-10 minute walk from the monorail stop to 'Ohana. Adding 15 minutes for the show itself, best case is 50 minutes from the start of wishes to making it. You're giving yourself 5 minutes leeway, and that's best case.
The only way you can really give yourself any chance is to stand as far back from the castle as you can on Main Street, and once it's over, turn and bolt (don't run) to the monorail. Being that far back, though, you won't get a good view of the projections. Even then, you're hoping that you can get on a monorail almost instantly upon getting to the station.