Rob,

Wouldn't hot water work? Even with picky bushmasters, which typically want rodents much warmer than other vipers, very hot tap water works.

The only EDB I ever kept (for a short time) was a WC and was the exact opposite. I had to thaw the rat, then lay it in the cage and wait. Usually the snake wouldn't eat the rat until it had been in there a couple of days and started to smell funky.

MH