The Cruz cultists would never vote for Trump anyway. Don't even bother trying to win them over. They are not rational people. It's like trying to convert one of Jim Jones' followers.
Yeah I know one Cruz never trumper. His eyes glaze over just like a cultist. He is never going to concede, he flat out believes Hillary should win to pave the way for the one savior Cruz in 2020. They are all like him, no sense wasting any further effort on them.
Trump has forged a coalition of real diehard conservatives, evangelicals, moderates, Indies and Dems. Even has brought some borderline establishment types with him.