Been working a bunch on this LNbits extension with the boring name "nostrclient" which is a nostr relay multiplexer.

One relay in, twenty relays out!

It acts as a bridge between your client and a bunch of nostr relays. You can add one single relay in your nostr client (this nostrclient running on your own server) and connect the nostrclient itself to 20 relays.

In LNbits, we also use it to give other extensions always-on nostr functionality!

Try it out and help me find bugs!