Whenever I'm trying to get a mouse eater to start eating rats I usually try a large crawler rat or a small weaned rat since they are a similar size to an adult mouse. I do this because as python1024 said the size of the rat can intimate your BP.
I only feed live so I don't know any f/t tricks but when I try to make this switch I leave the crawler/weaned rat in a container with a mouse for a little while to get the scent of the mouse on the rat. Once your BP takes a crawler/weaned rat the hard part is over, you just increase the size of the rat every week a little bit until you get the desired size. I've had an almost 100% success rate with this method. My only failure is my male Killer Bee that will only eat hopper mice>< I have not given up on him yet, one day he will eat rats!
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