Programming on an Android tablet

You can install vim, git and ranger on termux. So the minimal setup is pretty easy to achieve.

Set up a headless Raspberry Pi and connect by SSH and VNC. To connect the two devices use a USB cable.

Alternatives:

• connect them both to a router using Ethernet/wifi.
• use a very small PC in headless mode so you can run x86_64 executables.
• access a shared git repository on the cloud using local clones on both devices to share files

This may be less sexy but it is solid and reliable.

Another option is an online IDE such as Replit, which is good enough at least for hobby projects.