FYI: Technically, you are asking if you can "Bi-amp" your speakers, not merely "Bi-wire" them.
Having that much difference in power would probably yield more problems than it would be worth, IMHO. (And I imagine that the power reserves of a dedicated power amp are much greater than a receiver's power reserves, which would only make things worse.) And typically, a dedicated amp has a better sonic signature than a receiver, so you will probably notice a difference in quality.
However, that being said, you can try it and find out. (IMHO, having the reciever on the top end makes the most sense.)
Good Luck, (and let us know how it turns out if you decide to try it).
Having that much difference in power would probably yield more problems than it would be worth, IMHO. (And I imagine that the power reserves of a dedicated power amp are much greater than a receiver's power reserves, which would only make things worse.) And typically, a dedicated amp has a better sonic signature than a receiver, so you will probably notice a difference in quality.
However, that being said, you can try it and find out. (IMHO, having the reciever on the top end makes the most sense.)
Good Luck, (and let us know how it turns out if you decide to try it).