Of course he would be a Republican.
Remember, he said, “I didn’t leave the Democrat Party. They left me!”
But I agree that he would have a terrible time keeping HIS Eleventh Commandment...”Never speak ill of another Republican”! ;^)
And I believe that today he would say exactly the same about the party he went to after them.
Writing in Reagan as an independent. The thought of that is almost enough to get me back into the voting booth.