pupa on Nostr: Not to my knowledge... I've read some stuff about having relays update each other but ...

Not to my knowledge... I've read some stuff about having relays update each other but it's a work in progress.
Meanwhile, nostr.wine (a paid relay) are running a filter that can broadcast your notes to the biggest relays and pull data for you from most public relays which addresses your concern.
https://github.com/nostr-wine/filter-relay/blob/main/README.md