Question How to "Bake" / "Merge" several triplanar materials into one ?

Context :
- My background decoration is made of a lot of gameobject cubes.
- Each cube has a script attached to it in order to select the texture, rotate it, flip it. This affect the texture independently from the mesh (triplanar projection)

Problem :
→ To optimize the game, since this is only a decoration, I want to merge all the cubes into one static mesh with one material


(Currently, the MasterCubeMaterial script :
- takes the original shadergraph material
- creates a clone of it in order to tweak every cube's material value independently
- Send the values of the specific cube to the shadergraph material)