I played a scrimmage yesterday against my friend, who put his SG trainee in spot of center just to get some minutes. Needless to say, his SG made quite some shot attempts from semi-distance and one three (which went in) and he was third scorer of his team. So I think, especially in outside tactics, your C will probably take quite some shots from midrange and also 2-3 threes.
Although for outside tactic, since your C will not be a "salary monster" and his inside shot will be a bit lower than oppositions', I'd recommend also good passing on such C. If he has atrocious PA and has to make an IS against tougher C, he will always make the bad decision and miss a lot of inside shots instead of passing around.