I know this seems silly but.. if you polymorphed into a human couldn't use you throwing? I know this isn't what the OP was asking.. but it would let you ride a dread mare.. I would think.. of course you would need magery but thats the only way I can think of a human or elf could use throwing..
As for it working as ubws I would say no..
I would try a gargoyle out I think if the altering went both ways.. I refuse to alter a crimson, mace and shields, etc to TRY a character out. If I could alter the items and alter them back to human if I didn't like the character I would defenitly give it a go.
Anyways sorry to go off topic here.