Just think, when he is full grown and you are feeding him appropriate size rats how bad it could get if the rat fights back.
So how bad can it get

Live feeding can be perfectly safe if done by a responsible owner, full grown snake does not mean it gets a full grown rat for example I never feed anything larger than 125 grams rats (more or less) each week (even to 3000+ grams females) and I am yet to see how bad it can get

To the OP the choice is your the things you need to weigh in are

Convenience, is it convenient for you to feed live and will it remain convenient do you have a reliable source of live feeder will it also be cost effective etc.

Now if you feed live will the animal ever switch back to F/T? Well there is always a risk that he might not or it will take a long time which is why you need to be sure this is really what you want to do.