if i were you, i'd just keep doing what im doing and let devs roll there heads against this for a while. it's just all part of the nostr process.

as for receiving only lightning, right now that's not something that can be guaranteed, perhaps in the future if clients implement a profile feature and setting.

really it's only a few users doing this so again i wouldn't worry to much about it for now. ill let you know if this thing gains more traction or not.