Well, if you're a conservative/Republican can't tell the difference between Donald Trump and that of Kamala Harris, you are definitely a neverTrumper. It's not so hard to define the term and it's quite common. Earlier I did give examples of some I consider neverKamalas, but they are few in numbers.
There's scads of neverTrumpers - the entire Bush family, a lot of the staff at NR, that obese guy from NJ, the Cheneys, the Romney's just to name a few. And they are establishment Republicans for the most part, though some do come around - Mark Levine, Nikki, other GOPe. The only non-GOPe neverTrumper that I can think of was Ted Cruz years ago, but he's not one anymore.
If Trump loses (don't think he will), it will destroy MAGA but it also could finish off the GOP, at least on the national level. California, one-party rule forever. I think neverTrumpers should skip the top of the ballot then vote R down ballot, but if they can't stomach Trump, they shouldn't vote at all for either.