I’m definitely interested in this, but it’s very difficult (and unlikely to come to fruition) to do this on Android.
The Android model for USB device support is so unlike anything else that even getting basic stuff (like interfacing with a normal Meshtastic node over USB) is incredibly challenging. Normally, on Linux, you’d use a kernel mode Linux driver – probably one of the built-in ones like ch341 or cp210x, stacked on top of usbserial – to communicate with T-Beam (or LoStik). Android has neither ch341 nor cp210x nor any of the “normal” USB drivers used for stuff like this. The things supported out-of-the-box are things like USB audio, USB HID (keyboard/mouse), and USB mass storage (flash drives, portable HDDs).
Stuff like USB printers, or serial ports, etc. don’t have any support on Android, which is what’s needed for such a project; implementing support for T-Beams, T-Echos, RAK, LoStik, etc. would require re-implementing the corresponding USB drivers (e.g. for USB serial), but in user mode, using the Android API for USB Host.