If you can still modify the wings without interfering with the skeleton (or you can take them from a wyvern), then what about the lower part of the body...? Any ideas?
A wyvern as a wing donor is not a very good option.
1) Find someone or learn how to create animations in Alias Maya 6.0.
2) Adapt the plugin for Blitzkrieg 2.
Sincerely, Psatkha