I did this ....

Run a bath of hot water. With the bow strung, I put a large C Clap snuggly on the upper part of the limb about 6-8" from the tip. I emersed the bow in the bath for about 5 minutes I think. I then torqued the bow using the C clamp as a grip in the opposite direction of the twist until the limb " looked" straight. Take the clamp off and leave it to cool still strung for a day or so. Do it again if the twist remains. I have done this once and it worked great on a twisted limb that would track 1" off the string groove when drawn.

Its not worth much with a twist, you really haven' t got much to lose by trying it.