hi,
congrats on the successful food input. since you have a snake that eats rodents of some form or other i wouldn't mess with lizards. too much hassle. you should be able to switch him to lab rodents of some type (if not mice, then dwarf hamsters, gerbils, rats, something of the right size) within 0-3 feedings or so. like a previous respondent said, you've broken the ice with a voluntary feeding, that's usually the light at the end of the tunnel. maybe you could clip hair off a roadkill for a couple of tries at scent-transfer. try both pre-killed and live, sometimes snakes are shy of live animals, sometimes it gets them hot for the kill, who can tell what temperament yours has (yet, anyway). oh, if you do big meals, you could feed the snake every 3 weeks or so, no problem. i think most people overfeed their vipers, maybe you can avoid that.
uh, hantavirus is a nasty bug carried by deer mice (Peromyscus), and maybe some other genera. don't think many (if any) other taxa carry it; i'm pretty sure Mus does not. it's an airborne-transmitted thing that's pretty scary. first now-recognized cases were in the '50s i think, but it was not recognized for what it was until the early '90s or so. occurs in about every state but most prevalent in 4 corners region - hence old name navajo flu. it moves into your lungs in "dustified" urine & feces, or so the thinking goes. the fatality rate exceeds 50% (definitely not just babies and old folks), and there's no treatment other than basic supportive care (keep you hydrated, sublethal body temp, etc). so anyway, think about that when you're flipping trash and boards for herps and see all the mouse pellets and smell pee; don't breathe deep!
you can buy hantavirus-free breeder Peromyscus but they're not cheap, i hear. but you shouldn't need that.
cheers,
jimi
p.s. careful with that snake, i can tell you're a newbie, and that's not really a starter animal i'd say (way too high-consequence, do some reading)...but there's no experience like actual experience. good luck.