While I sympathize with the intent of the law, this is a great example of why it's dumb. There's no possible way you could make that ring, in a reasonably ring-sized form factor, with today's manufacturing processes in such a way that an end user could replace it.
If their official sizing kit 3D models are accurate(better be!), there's exact amount of space for an SR721W watch/hearing aid silver oxide coin cell. And these are not even the tiniest of standardized replaceable batteries.
You're too generous. I feel like the entire production run of this ring could be equivalent to a single discarded washing machine. This law is hamfisted.
Perhaps the ring need not exist.
Maybe it's the ring that is dumb?
If this law pushes back against the idea that it's ok to make endless tech products which are essentially future rubbish as soon as you buy them, then I think that's a good thing. Perhaps products like this just shouldn't exist until we have better ways of dealing with the remains.