Last night I forced him to self-feed. Previous attempts had him give up and I had to hand the worms to him one at a time. They went in like logs into a wood-chipper: as one vanished I shoved another in, and so on until I had a very full bat in my hand. He'd sit still for a long while, squeeking happily and grunting every time he tried to move.
Last night I simply piled about 25 worms onto the dish, shoved his nose in and zipped the tent shut. When I checked this morning all the worms were gone. This means I can cut my handling back to a minimum.
Tonight I'll lock us in the spare room and try to get some flight time in.