Working with UV map outside the grid

Hey all, I have a question about a workflow regarding a mesh model that works if the UV maps are out of grid. So I have a model of a wooden door with individual planks defined as a mesh. What I want to do here ultimately is to break up the evenness of the door and give some variance to the gain or brightness to each planks. I have thought about using Substance Painter to give variance to texture based on each UV island, but the main issue that I am facing is the fact that this texture set up only works in this UV layout that was generated by an add-on called Floor Generator 2.0. I am wondering if there is any way I can work out of this hole. Any help would be greatly appreciated. I am working in Blender Octane.



Please refer to the video.
Addon will include similar features.