Honestly, the answer is "No, but..."
The intellectual energy of the party is not on white nationalism, and that is not a prioirity of the majority of its members, who would gladly vote for a Marco Rubio/ Nikki Haley ticket. Or Ted Cruz and Tim Scott.
However, under a two party system it is a more attractive place for white nationalists than the party that has a disproportionately high number of African Americans and Hispanics.
There's probably going to be a well-made argument that Donald Trump represents a different kind of conservatism than the three stools. He's not really a foreign policy conservative. He's not a social conservative. He's not a fiscal conservative. But he does appeal to a fourth group. Let's call them privilege conservatives, who want to keep/ bring back the social order in which they held on to a higher share of power.
Good post
^^^^ Mister Mets sums up my thoughts better than I could articulate them.