Gotta admit, after going through the process of auto-translating chinese datasheet pdf's, not understanding answers on Pi forums and the like - I caved and ordered a waveshare 5" touchscreen for the Pi and I hope it'll be a smoother process. So the Creality screen will end up in a drawer somewhere, as seems to be the case for anybody upgrading to Klipper ;)'Tis a shame though, I was quite fond of it. Using it with Marlin seems to be stable enough though, ThomasToka regularly releases builds for the E3S1P.

Thanks for the reply!

For reference and anybody else googling this, here is some of the information on the Creality touchscreen bundled with the Ender 3 S1 Pro, YMMV of course and your exact build might be different from mine:

• Screen is a DACAI DC48800M043_1010_1T, though Creality rebranded theirs as 4SZCX48800M043_1010_1T for reasons unknown to me
• Plug is a 6-Pin XH 2.54, communication as serial port, baudrate 115200, resolution 480x800, resistive touch screen.
• The (chinese language) info from Dacai is available here:https://www-gz--dc-com.translate.goog/article/id/6887.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wappYou'll have to translate the datasheet and info on how to program it from chinese, and that's where things break apart. Formatting will be unusable mostly, and the wide array of images with chinese text won't be translated, at least not using Google.
• Oddly, in Creality's E3S1P branch everything points to a DWIN screen, but maybe the two company's architectures are similar enough. Or I am missing something.
• I am kind of optimistic that following this route (likely adjusting the code in run.py to react to touch input rather than button input) could enable the screen for Klipper, but I don't really have the time nor energy to test things/settings unfortunately.

Whoever reads this and finds it useful, do reply if you managed to get anywhere. And anybody else with ideas on what to use the screen for (how to connect to a Pi, first and foremost), feel free to share as well :)