I assume you’ve tried the existing Mobile Web version (i.e. through a web browser)? It’s actually not bad, just a tad slow ([probably depending on your phone’s JavaScript performance). And of course no offline support. But I’ve been pleasantly surprised. I’m pretty sure you can most of what you outline above.
This is a pretty interesting idea actually. I have previously requested this more broadly: Bi-directional integrations/sync But I was primarily thinking of wanting to write from Fibery back to the other tools and I didn’t even think of the potential additional utility there of being able to edit certain data via other tools that have dedicated mobile apps. This reminds me of how Obsidian did things before they had their own mobile app, and it worked actually quite well. And hey, any additional support for bi-directional integrations is something I can get behind. 