When we've changed mousers over we just did the tough love deal. No mice, no smell of mice, skip 2 weeks of food offering, then offer a nice plump rat of a small size (pink, fuzzy or very young pup). Something easy for that size of snake to catch. Most of ours switched over fairly easily. I do have some VERY dedicated ASF's eaters but they tend to be the wild caught rescues we've taken in and a couple of picky eaters.

Some bp's like Slim said are very prey specific so you can only try and see how it goes.