I took that as OP having a laugh but I guess I'm not sure if serious or not.That I don't like, and given how much Facid is designed in to be used, it will be up all to frquently. Plus a hinged component such as that could easily fall of out of spec and not be accurate and or break easily. Either way its not visually pleasing, and poses significant risks of failing.
Could be the next iPod Touch? Or SE with no FaceID and TouchID on the back?