Handling isn't recommended. Like I've said, I'm not too terribly familiar with pacmans. You may be able to place a paper towel on top of the substrate, and then the worm or cricket. That way, there's no risk of him swallowing substrate.

I would still attempt to feed him cut up worms. If you keep doing it, chances are that he will eventually go for it. If not, go for baby worms. That way, they're whole, but not too big to cause impaction, etc.