I love stuff like this. I made a widget for MacOS where you can see incoming |hi messages sent to your Urbit, as a kind of poor man's p2p chat. But I didn't add a feature to send hi messages, so you still need a CLI for that.

You can see what it looks like here: https://www.youtube.com/watch?v=_bAx4Jx39jE&t=384s

(it's the widget in the bottom right of the screen)