Bitcoin for Local Business has a #nostr embed that's just an <iframe> pointing to a  nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg web deeplink. Genius!

https://m.primal.net/HpGg.png 
https://bitcoinforlocalbusiness.com/