Sorry about the late response, I’ve been afk for a bit. I had started to roll the shaders into one of my other projects to simplify code maintenance.
- For substance, you should be able to create a parent material and use material instances just like any other material.
- An object with no UVs should be fine. Worst case scenario, you have to auto generate UVs. They don't have to be pretty since you're using texture projection.