If I'm understanding correctly, this should do what you need: https://github.com/Dolu89/nostr-proxy
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Props to #[3] !
How functional is this, #[4] ?
It worked relatively well when I used it, it can just be prone to sometimes crashing and needing to be restarted, especially if you use a large list of relays.
It works, but it can be improved of course.