Sounds pretty similar to what Lostbelts really are, at least on my interpretation since we don't have the full answer yet. Or is your idea to a create a truth that doesn't need a pin holding it together like Lostbelts do with their Fantasy Trees? Considering even normal human textures require pins like Rhongomyniad, Wukong's staff, Titan Atlas, etc., I'd a pin-free self-sustaining RM would fall into Magic territory.