Thanks again for the input. Ok I have a good idea of what to do. If the damage is slight/moderate, then align cold as there seems no benefit to adding heat. If the twist is pretty serious I will replace. I figure this is best done by bisecting the old dropout thereby reducing the amount of heat necessary to sweat out the old tabs individually. Then clean up and replace.
BTW I just found this forum, seems I missed it for some time. Good to see your name pop up Andy. I remember you from various incarnations of different frame forums. Always reliable and helpful info. Cheers.