Hey Rod. GM. If you think that it will be useful to other people go for it (a few folks asked for whitelisting multiple IPs on Haven).
Adding NIP-42 auth for all queries should be trivial on any Khatru based relay, including SW2. See: https://khatru.nostr.technology/core/auth#signaling-to-the-client-that-a-specific-query-requires-an-authenticated-user
Cheers,