I do this all the time with maple and elm, esp. Practically every bow. I would rig a form and just crank it over, cool and dry, slightly past the amount of correction you need, and go over the area you want bent with dry heat. Simple and effective. I will warn you to pay attention to what this does to the ROTATIONAL alignment, though. Sometimes you line up the tips linearly and find that the recurves are now in slightly different planes.