I mean, why not 
jbot installed VNC app to control touchscreen from his phone…
I’ve opened up one of my controllers, easy with the right tools.
It has a button on PCB, but I don’t know what it is doing. I tried pressing it and holding it while giving power - it doesn’t turn on this way.
Pressing it while the system is booted doesn’t do anything.
Full resolution - awesome-snapmaker/images/Snapmaker_Parts/SP_2.0/SM_2.0_Touchscreen_PCB.jpg at main · shurushetr/awesome-snapmaker · GitHub
There are some communication points at the top, between the button and the antenna - but an IC is missing, so not sure if these will do anything.