> You can buy SBCs that run FORTH natively

Even very cheap and readily available microcontrollers like the STM8 can be used in this way [0] [1]

I’ve found the microcontroller for less than 20 cents on Ali express, easy to solder. Add a capacitor and a TSSOP-to-DIP adapter board and you have a breakout board for less than 50 cents that can run Forth.

[0] https://github.com/TG9541/stm8ef

[1] https://hackaday.io/project/16097-eforth-for-cheap-stm8s-gad...