Replit's mobile app has a decent virtual trackpoint-like cursor widget. If you added an APL keyboard as you suggested, it might be a nice combination if you leave out their AI autocomplete.

If you want to get extreme about input method minimalism, you might be able to remap Applejak[1]'s WASD / E input approach to swipe and tap gestures.

1. https://internet-janitor.itch.io/applejak (previously discussed here https://news.ycombinator.com/item?id=26188165)