If you decide to make him a guard, I'd probably try to train only 1-position OD and PAS right through his age 18 and 19 seasons. I imagine you could get 15 OD/10 PAS at the end of his age-19 season. That'd give you the option to be more versatile with your training beyond that point, while already having a valuable role-player.
The SF route is attractive though, too. I don't think his height matters very much. My 6'5" PF popped inside skills extremely quickly.
BTW, your club team should have more than 6 players. Pick up 2-3 more players (even 1k scrubs if that's all you can manage right now). You'll greatly benefit by having better gameshape.