Brady typically does a couple of private signings every year with a starting price of around $900 per item. I'm pretty sure it's TriStar who dictates what he can or can't inscribe.
I heard he avoids public signings because doesn't want to charge kids for his autograph.
Fanatics reps at public signings were the ones who approve what Ortiz, Betts and Bogaerts could inscribed on an item. Good luck getting anything inscribed game useD. Of course Fanatics will be more than happy to sell you a game used item with an inscription from any of those players.