I have to donate to fiatjaf for nak.
That tool has been completely amazing as a swiss-army-knife of all things nostr. It is SO good. In the right hands, it is literally limitless.
Just as a thought:
You can grab some data, encode it in base64 and then push that as an event to a relay - continiously - and let another client pick those events up. this works especially great if you have a little network with a relay with a super short TTL (you can configure strfry for that) and thus allows you to "abuse" nak/nostr as a makeshift pubsub system XD
I've done that before. It's fun.