I have done it with live pinkies (Only after the snake would not take f/t brained ones) but make sure the process kills the pinkie quick. A lot of time I sever the spine right behind the head almost cutting the head off, working the point end of the knife ( old fillet knife) into the brain. Be extremely careful, Dont cut your fingers. I have had a few non-feeder eat this way. I also made sure as soon as the pinkie was prepared it went right in with the snake in the deli cup with no delays.
Not sure why they wouldnt eat the f/t brained one but they would eat freshly killed brained one. Picky little buggers.....