It's pretty easy to try, but it doesn't always result good, if you get HerrDave's permission i can try it for you (i have mdlvis Matrix Eater), but i don't promise a good result as i'm not a moddeler myself and i only know how to perform simple edits to models xD
What i have in mind is:
>Take the myrdraal model
>extract blood mage model from the MPQ
>transfer myrdraal's animations to the bloodmage model
>???(here we need luck lmao)
>profit!
EDIT: i was talking about Mdlvis, when i really meant Matrix Eater, but it's all the same, i'm trying to edit it now, HerrDave is a very chill guy i'm sure he will give you permission, if we don't do anything stupid like uploading our frankenstein i don't think he'll care, you have to give him credit for his model's animation in the credits of your map tho