Sounds like it'll be a really cute pup, especially looking at pics of yorkie apso's on the net and on this forum. I do agree that a 6 week old puppy is too young to leave its mom though, best of luck fo them both! And btw here is a link with pics of yorkie apso's if you want to check it out:
Yorkie-Apso Information and Pictures, Yorkie Lhasa Hybrid, Yorkie-Apsos