A little bit more hacking and now my NIP5 identifier is the same as my LNaddress:

openoms@pay.diynodes.com

The nginx snippet used in the redirect to btcpayserver serving the lnaddress:

location /.well-known/nostr.json {

add_header 'Access-Control-Allow-Origin' '*';

alias /var/www/html/.well-known/nostr.json;

}

Next step to move both to the root domain.

FYI #[1]