I'm not sure about bearded dragons but my friend fed his Iguana a mouse once for what reason I don't know and there was no sticking your hand in there after that, so hopefully the taste of blood doesn't keep him aggressive.

One thing you can do is try like gardening gloves or something similar so that way when you reach in the tank to take him out and he tries to bite you he sees that it doesn't affect you and perhaps he'll stop. If that doesn't work then I have no idea.