I'm really close into doing this, 2 separate UV maps made, my one UV is the whole object and the other is just a face to put the text on. I have 2 issues so far. One: I can only seem to get 1 texture to work at a time and my one texture that is just on the face repeats itself. I can't seem to make it stop repeating when I set the UV texture settings to just clip. I'm unsure how to get these working in Octane through blender.
Here are some screenshots- The UV maps are fine so I didn't bother taking those: