@amiloradovsky@functional.cafe this guy is still alive and kicking
https://www.ebay.com/itm/Motorola-Photon-Q-4G-LTE-Use-your-own-NANO-Sim-card/174449236285?hash=item289dfc193d:g:zo4AAOSw9bRfbBxn
works pretty well with OSMAND offline maps, and pure GPS navigation. The apps are obviously not optimized for keyboard input, but some of them recognized some basic desktop-GUI-esque commands, so if you don't mind digging deep you might get things to work for you. You can also chroot into a proper linux environment for the note taking and stuff, and even run an x server and vnc into it, but it's slow and the kernel is ancient. Battery life is the biggest issue as per usual, low capacity, not easily replaceable, but there are mods (involving cutting some plastic away) that make it swappable.
It also has an expensive, bulky and beefy spiritual successor that should be capable of all that and more:
https://store.fxtec.com/product/fxtec-pro1/