Hey @CarloK, is something like this https://github.com/Ultimaker/UM2.1-Firmware/blob/UM2.1_JarJar/Marlin/temperature.cpp#L552 that would connect that "direct register write"? if so, how can one compile it with Marlin 1.1.x? I follow the instructions, but no avail.
Also, I found this version https://github.com/nullsibnelf/Marlin-for-UMOplus-UM2Extruders-E3Dv6lite
that has the bltouch option, the hotend fan works, but there's no define ULTI_CONTROLLER. So very unfortunately the screen doesnt work.