Just realized that our idea is the closest to this, just the other way around. Put Nostr in VS Code, which already has an e-mail client, markdown editor, Asciidoc editor, Linux terminal, PlantUML compiler, etc. Just need to add a Simplex client, as well.

I'd never use anything else, on my PC, ever again. 😂 Just give me a Nostr button, in the left-hand menu, to open up my Nostr apps, and I'm done.