This isn't for me as it is, but I can imagine how you can evolve it by using remote key signing like the nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqyw8wumn8ghj7un9d3shjtngd9nksmrfva58getj9e3k7mf0qqs8u5uf0rd2p9wmdxxaznpn54tkq8wwspmljy0cjqw6jdgm5kv84ds3selle remote signer, or key rotation, which I'm currently write a NIP for.

Delegated authority is coming soon to NOSTR, I think this is when your service will be feasible.

I would definitely fix the URL inclusion issue, even for you Bitcoin Archive client, that definitely makes it unusable.