What I find works very well for me with any snake is to completely thaw the feeder, leave it out in a bowl right near the cage for a couple hours, then right before I feed, I blast the face of the rodent with a hair dryer, aiming the warm rodent scented air at the cage. Then, when the face is nice and warm, I dangle the feeder from the base of the tail in the enclosure. This usually makes them go for it really well.
If I were you, I might refrain from making the feeder move because it does freak out some snakes. Or, if you want to make it move, what I find gets them interested is dangle it near them, then make it "walk" away, snuffle around a bit, then go back towards them.
If all else fails, you could pre-scent like I described in the first paragraph and if it doesn't go for the rodent right away, leave it near the door of it's hide/wherever it was overnight. They might take it when it's dark and quiet in your house.
EDIT daaang, you guys type fast![]()