Thoughts on this steel option?

I think that's quite a popular option would be way better for hygiene, its similar to what @PornAddict103 wears.

Im not a fan of stainless steel personally especially the cheap ones they seem to have really chunky, heavy base rings. I would see if you can find that with an "ergonomic ring" as I find they sit better.

 

That is similar to what I wear and I feel it should work well for you, trusting you can fit yourself inside it. As for hygiene, you really should unlock yourself at least weekly for a deep clean or you could get skin problems along the way. What I do is keep a key in the bathroom just for that and I made some very strict rules for using the bathroom so I’m not tempted to “cheat”.

I keep the other key locked in lockbox, which is also locked in a safe on the other side of my residence. This puts up multiple barriers to get to access to my key, so I can unlock myself in the event of an emergency, but not in a whim.