I think you're on the right track... perhaps you can invest in sinking pellets, and go with the cup idea? I think that's really smart. I know some people also use a little plate, and always put the food on that.
I would also something every time to let him know that food is coming. If it doesn't freak him out too much, tap the glass gently twice or something every time he's gonna be fed.
I would also something every time to let him know that food is coming. If it doesn't freak him out too much, tap the glass gently twice or something every time he's gonna be fed.