This is really cool. The ux would even be better with an app like #keychat where after the receive keys are generated, there is a add to keychat button or so. Already possible to just copy the key and create a chatid manually but this would even be better. #keychat is really the binding glue for #nostr clients.
I made a little project called pingkey https://pingkey.xyz/ it is a messaging app works like traditional mailing. You setup relays as your mailbox, people write letters and post them to you. Each letter must contain a POW which then turn into a unique POW stamp. It is that simple and I imagine it will become a alternative contact card for those people who are old enough that just hate social network and prefer to keep this simple way just like me. Feel free to try it and contact me https://www.pingkey.xyz/p/ce6232feaec4e6d01a4e00daa3648030c42017bdf589e34b53744fc49c5cba8a and give some feed back. 
Discussion
That's a good idea 🤙. I will talk to keychat about how to do it.
👍We are adding support for Universal Links.
https://developer.apple.com/documentation/xcode/allowing-apps-and-websites-to-link-to-your-content/