Oh wow! Article writer here, can't believe I didn't come across this when I was researching. Kicking myself haha
There were a handful of reportedly great pixel drawing apps for TRON, which I'm going to try when I'm back from vacation. So thanks for the info about TRON VMs.
uITRON isn't rare on microcontrollers, especially in automotive. A lot of uC has official BSPs based on it.