What's the case against using your personal relay for that? 1. Have a personal relay (which you're incentivized to have anyway) 2. Host various content types on there 3. White list selected npubs for selected content
Having a personal relay = Being able to target your publications like an email, but for every content type nostr:nevent1qvzqqqqqqypzp22rfmsktmgpk2rtan7zwu00zuzax5maq5dnsu5g3xxvqr2u3pd7qyt8wumn8ghj7mnfv4kzumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezumrpdejz7qpq0g8cuequ2x9f2z42jkr86sf56nklyjp3v84dh9v9gjk3hadzavps3ghcz8
Targeted publication is mostly about inbox relays because you'd be "tagging" your selected profiles in their inbox with the event you want to share exclusively with them. Your personal relay is already part of the event, so their client knows where to look. Next you need good UI that makes it clear that it's a private publication. I use this kind of headers: https://cdn.satellite.earth/7bcfe1478007d70033b5e22667be930cb91608923ddf3fa9f5f9270e6c8899b9.png Which matches nicely with the targeted publication you can do with Community relays: https://cdn.satellite.earth/da6911b627e2d19096bc57d3259b06dfa54f1401a6688c4beac3db5cc5d6c62d.png