Very interesting. Are any other clients doing this? Would you envision clients sharing filters like this?
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I don't think so. Everybody just saves a huge list of relays in their databases.
There are many places clients could share bloom filters. This all started with this idea: 
In this case, I proposed sha256 as a hash function so that clients didn't need to code MurMur3, but MurMur is so easy that we can just teach people how to do it.
GitHub
Per-event AUTH keys by vitorpamplona · Pull Request #1497 · nostr-protocol/nips
This adds two special tags to authorize certain keys to download events.
This is similar to NIP-70, but in the opposing direction (read instead of ...