So is outside ISO the right way to go?
It might work. The thing is that you'll need other guys on the roster who'll hit jump shots if they're open, though. You may want to play him more at SF so he'll probably go against lower OD defenders, though hopefully he'll be doing a lot of slashing to the basket too.
I also think if you're training the 20yo that he desperately needs passing. His skills are low enough that he'll probably never reach his potential cap but if you're planning on improving his skills to improve your roster, that's a definite area of concern.