Coracle has something very similar to this (pubkeys, relays, groups, rather than topics).
https://coracle.us-southeast-1.linodeobjects.com/invites.mov
Here is the user story. Shout out to nostr:npub1aeh2zw4elewy5682lxc6xnlqzjnxksq303gwu2npfaxd49vmde6qcq4nwx for inspiring discussion at nostrville on my favorite user story thus far
Coracle has something very similar to this (pubkeys, relays, groups, rather than topics).
https://coracle.us-southeast-1.linodeobjects.com/invites.mov
Love the personalization. Nostr needs more personalization