Oh please. In most elections the choice is between a Republican and a ‘rat — the other candidates usually have no chance. I vote for the better of the two. That doesn’t mean I endorse every position of whoever I vote for — sometimes there is not much of a choice.
I would vote for a 20% R over a 0% D because I’m better off 20% of the time and the other 80% it does not matter.
And as long as there are Republicans that vote like you, we will have 20% conservatives.