Seriously. Go watch the state tourney games this week. This is the best of the best. You do the math.
Play full no questions asked. You son will develop more playing FS.
play split like previous poster and be an alternate for full. No miaa violation as long as he doesn't skip a practice or game for HS team.
Go wherever he will play and develop. Sitting on the bench will not make him a better hockey player.
Varsity hockey practices are 90% special teams play and is usually First line goes 4 times, second line goes twice, 3rd and 4th line go once. FS hockey is a little better, but if your son is not a top 6 or top 4, the same thing happens.
As for game ice, even the 3rd/4th line kids on a FS team will see shifts, but don't think for 1 minute that it will be rolling lines. Good luck.
U14 teams don’t have 4 lines. Most teams will roll lines except in special team situations. Go where the kid will actually play, with kids who can actually play.
But then don't you run the risk of upsetting the Varsity HC who then see's you as someone who isn't "with the program" if you choose to play FS rather then sit on his bench and practice under him to learn the finer points of the game and have your kid "pay his dues."