I agree with the guidelines you propose.
However the fires associated with lithium batteries in consumer equipment mostly due to poor charging equipment, usually bought with cheap products.
Do you think the people who buy such ( cheap) products are going to adhere to the policy?
Also where are you going to find the lithium cops? Whilst I understand a lot of the technical detail in your proposal, most lay people are not knowledgeable enough to make those distinctions.
I agree it’s a problem of concern.
Perhaps a better way to tackle this issue is an education program in your community.
Maybe back thst up with a site visit by a suitably qualified electrician to check the equipment people are using. I’m thinking of a work area in your garage where people can bring their batteries and charges and get an inspection for free.