Crossing of python lines is possible and is currently in production. This is a Burmese/Retic hybrid produced by Bob Clark and available thru him for $2500.
Should you friend have success, there should be no albinos, but all should be het for albino. He could then breed back the off spring and have a good shot at an albino Burmese/Rock cross. Couple of things, these snakes rarely will cross breed on there own and the off spring are usually genetically week and will not thrive. And the ones that do, usually will not breed.