Photogrammetry Beginner to Advanced Starter Guide

I hope it isn’t too late to post here. I’m trying to find a tutorial or guide on extending a photogrammetry scan. What I mean is, I want to take pictures of half of the tree, and model the rest. How would I go about employing textures and whatnot from the scan on the bottom half.

Here’s my theory:
Import scanned model into Zbrush, sculpt tree, UVmap it.
Move into 3dsmax, import original scan, and sculpt. Align the two, bake textures onto sculpt.
Now take the half textured sculpt and just texture the rest of it in Photoshop. Is this a viable method?