Generate Texture while KEEPING UV's from Retopologized Mesh?

Hello, Travis – yes, that’s exactly what I did above, as I wrote.  My question is just a detail on specifics:

I manually edit the .mtl file from the .obj Z-Brush outputs (quads) to reflect the texture RC exports.  That is, ignoring the .obj RC exports (triangles) but using its texture.  Is there a better way to do that?

So far as I know there’s no way to export just the texture from RC, only the ‘Export:Mesh’ option in the ‘Reconstruction’ ribbon section.  It seems a little silly to have to export a large mesh as triangles from RC when already have the quad mesh from Z-brush, but I don’t see a way around that.