the thing with all these `Mutex<Cell<Option<OwnedThing>>>` and helpers that try to abstract it is:
- For 9x% of the code that can afford to use async, you should just use async and not bother
- For the remaining x% that really can't afford the 80 cycles of latency async adds, you probably won't want to use mutexes etc because they aren't zero cost either. You're better off unsafely steal whatever singleton or just do PAC register writes. 

so... I don't see the point in these helpers :D