Hello again!
Just released the app on the Play Store for Android: Play Store
Feel free to give your feedback as well. I tried to make it like the iOS/macOS version. For now, the only missing feature is syntax highlighting, but I’m working on it (I still have a few bugs with it)
Sorry to revive an old thread, but did you end up with something feasible from this exploration?
No… My previous company was a iOS / Android app, and after acquisition I left and didn’t have an immediate use-case for it anymore. I am still very interested, but I didn’t get back to this experiment anymore 
I can make the repo public if you are interested to experiment: GitHub - jfrolich/universal-ui
I’m in the process of generating bindings to various Cocoa frameworks by introspecting the Objective-C runtime. Just finished Foundation. Still not ready for a release, but it’s coming along quite well.