Fwiw I've called myself a moderate Republican multiple times on this site over the years. When I was a teenager in Maryland I would have said just Republican, but when I moved to Utah for college I realized I was WAY more moderate than the Utah Republicans were. I probably have gotten slightly more moderate since moving back to Utah 11 years ago. I haven't changed my views too much in the past 3 years, although being very anti Trump I have been feeling towards the Republicans a bit like Reagan felt towards the Democrats (he was originally a Democrat), something like "I haven't moved away from them, they have moved away from me." And I proudly voted third party this past presidential election.
Depending on what the Mueller probe concludes and how the Republicans in Congress respond to it, I may take the plunge and register as an independent. We'll see.