This is ridiculous. First of all, Perry? Coburn? Really? The establishment Republicans' last hope at a third party anti-Trump was Bloomberg.
Bloomberg is not, really, a Republican, definitely not a conservative, and he would have gotten more votes from Clinton, than from Trump. The objective of the third-party challenge at that point is not to win, but to give conservatives a chance to vote for somebody, without that somebody being Trump or Clinton. But electing Trump by running a centrist is not the ticket: they want to see Trump humiliated.