Another Update for anyone who cares:
The bathroom I have him quarantined in is the same one that I use to soak and disinfect the rat's stuff. I brought in a bunch of dirty rat hides and dropped them in the tub. Within minutes he was wind shield wiping the front of his tub and sticking his snooty right up against the air holes.
I figured that was a good sign he wanted to feed.
So I offered a pre killed tiny little soft fur weanling. Didn't even need to do a puppet show for him he struck it before I even had it all the way in the tub.
So much for him being only a live feeder
He's also put on another 8 grams of water weight.
He was still cruising looking for more food while I finished cleaning the rat stuff. Hopefully he won't have an issue with this little fuzzy and I can offer him a more satisfying portion next go around.