Leader keys + Evil mode make the keybindings pretty much non-issue on mobile. Emacs also has native Android port now, I've found it work quite well. There are apps like orgro[0] that make dealing with org files a pleasure on mobile.

That being said, it is not perfect. My ultimate (and imperfect) solution was to acquire a GPD Micro[1]. Now that thing makes up for all shortcomings of mobile devices, not just Emacs :)

[0]: https://f-droid.org/en/packages/com.madlonkay.orgro/ [1]: https://gpd.hk/gpdmicropc