I've had some success with my yellowbelly female who I assist fed for the 2 months (I took her on as an assist feeder as I figured it was a skill I'd possibly need in the future)
I have for the last 3 feeds, succesfully drop fed her by using a kitchen roll tube as a tunnel connected to her warm end hide, and sliding the F/T mice/rats half way along, they have all gone within a couple of hours of going in, a bit elaborate I know but it seems to work when she'd take food no other way :gj: