Paul,
you might consider putting it on a breading loan with someone who breeds many burms. They may have a larger selection of breeder females with nice color and have a track record of breeding success. After a year you get your snake back and half the babys and not much effort on your part. You will also know if it is fertile and in the mean time keep an eye out for a female.
Try to do it localy if you can or look into the breeder pretty well first.
Good luck,
Rob