Have you talked to the breeder to see if they will convert it for you? It isn't that hard to do. Do a search on this forum and you will see ton's of threads on how to do it. If it has eaten 10 times, it shouldn't be that hard to convert. The key is to make sure the rat fuzzy is warm (you can use a blow dryer), with the head a little warmer than the body. If you feed in the evening, with a pair of tongs doing a zombie dance, it should strike pretty quickly. Be patient and allow the smell of the rodent to permeate the room by unfreezing it in the same room as the snake.

Good luck!