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]

