Your problem isn't really with the "party", though. The party establishment detested Trump. They just didn't have the votes to defeat him.
Your problem really is with those voters who voted for Trump in the primary, and presumably with those who support him now. Absent that support from those ordinary voters/citizens, he'd be a footnote of a failed Presidential campaign.
But it should be realized that the voters whom you dislike aren't going go away just because Trump eventually will. Third party efforts will run into the same core problem: there simply are not enough voters who see things the way you do.
Unfortunately, I realize that.
Constitutionalism, morality, honor, integrity........... just a minority view now. Neither the Democrats, nor the Republicans care about any of those things.
Just power. Control. Populism. Being OK with distortions of decency and law because "our guy" is doing it.
The people who once at least claimed to believe in the same things that most of us used to believe in, no longer do.
I've not only lost the party I once belonged to. I realize that in doing so, the country is lost.