I'm also turning amber in a nip 46 signer
https://github.com/greenart7c3/Citrine
You can use citrine as a cache relay in nostrudel
https://nostrudel.ninja/#/relays/cache
For other clients for now you have to add it to your relay list
Discussion
Should I do a method on Amethyst that searches all posts in other relays and send it to the local relay?
In nostrudel it has a option called cache relay and when you enable it all events nostrudel sees is sent to the cache relay. Maybe make something like this and inside the localcache.consume send it to the local relay
Yeah, I was thinking the same, but with sync capabilities to minimize traffic, like on https://github.com/nostr-protocol/nips/pull/826
Both are great!