See my #48. Just what do you think such a party would look like? Forget about individual politicians with whom you are angry/disappointed/frustrated. Individuals come and go. The building blocks are major constituencies. Trump is not at home with any of the major blocks of the Reagan coalition. Most of them will support him this November because Hillary is worse, but that's not much of a basis for a reformed party.
I understand what you’re saying. However, every single person in my circle of acquaintances, almost all of whom are registered Republicans, have vowed to never again vote for any Republican candidate if Trump is defeated.