This is for verifying identity to contacts, not discovery. Nothing needs to be done on SimpleX's end for discovery but Nostr devs declined.
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What do you mean they declined? Was there a nip proposed for it? Clients could still do it if it was a good proposal. There is nip 48 proxy tags and nip 39 external identities that could hold simpleX information maybe
There was a NIP proposal for adding general contact info links which includes SimpleX. NIP-48 is for bridging content from other platforms, NIP-39 is for verifying identities of other platforms, which I suppose could be done for SimpleX addresses if there was a way to sign messages with the public keys. I think NIP-24 kind 0's are the most suitable for linking to SimpleX addresses as described here: 
GitHub
[FEATURE] SimpleX Chat links in profile · Issue #8 · retrnull/garnet
Is your feature request related to a problem? Please describe. Nostr DMs are unsafe. Developers keep churning out new flawed DM systems and nobody ...