Bad idea. Bloods are waaaay different than BP's in personality, activity and lifestyle. If you jump into purchasing a Borneo, go with a responsible and reputable breeder over a pet store! The animal will be better off coming from a good breeder than a pet store purchase. Hands down.
If you want to get your feet wet with a borneo, buy one, but it takes more experience for breeding these two completely different pythons. They are from COMPLETE opposites of the world, and getting to know each species on a personal level will help with a successful breeding farther down the road.
I just don't like the idea of "Imma buy this snake to breed it to that one and see what I get" Build your experience before you attempt anything more. Just my .02 cents.