Thanks for the feedback, everyone. For now I think I will continue to feed him in his enclosure, but start feeding him 2 mice (at least until I'm out of mice). I've double fed him in the past when he got bigger, so I don't think it will be an issue.

He ultimately did eat in his enclosure last night after being left alone with the f/t mouse. Will provide a second f/t mouse this evening.. and will plan to start feeding him 2 at the same time starting next week, which has worked well in the past.