

Not really read up on it yet, but can you do serial over Bluetooth? Quick Google gave me this: https://raspberry-projects.com/pi/pi-operating-systems/raspbian/bluetooth/serial-over-bluetooth
There may even be an android app that could help. Suppose it depends on the scope of your project.
Funnily enough I may have to do something with this tech myself later in the year.
That when I grew up I’d know what I was doing and my body would work.