Okay I figured out better renders. My first solution: using ResForge to replace brick paving to a solid green chroma color.

This works, but unfortunately dynamic daylight lighting and clouds passing overhead mean anything outdoors is inconsistently lit. My solution here was instead replacing nil (texture for no tile indoors) & indoor board flooring textures with a solid green chroma color.
I couldn't find the wall texture. WhateverThis is then color-to-alpha'd out in Gimp (don't feel like cracking photoshop tee hee). There are a couple really happy things about this setup. We skip exporting models to Blender entirely, and everything matches in-game appearance perfectly... because it is in-game. We can use build previews for buildings, even if they cannot be indoors, and these previews inherently display default materials so that's one less thing to worry about. The ONLY exception something like a food trough, which I feel we'd prefer to render with food inside. Can probably change the display via ResForge, will figure that out.
Two examples of the final results (sizes can be changed obviously):

Have not yet tried to switch an object's model to a creature idle frame, because I know it's going to be annoying. Will figure that out too!