I always thought as a stomach sleeper why not get one of those massage table head rest things, face down symmetrical and wouldn’t gravity help keep things open then? Just have to build it into a cozy bed, not sure if that would be comfortable though.
I also thought of this idea and wanted to try it. Gemini said not to do it bc when we sleep, we naturally want to change positions. Thus, maintaining one position all night would cause muscle cramps?