A lot of people store their sports gear under their bed for this purpose. Not just their bat or whatever, but all of it. Storing it separately is a sign of preparation, and makes it not a weapon of opportunity. Storing it where it actually belongs is a legitimate thing though.

Regardless, it's still fucked to the very core that self-ownership (and therefore the defence of self) is illegal. If you don't own yourself, you don't own anything. Which is, of course, the entire point of trying to outlaw self defence.