@AlphaElwedritsch - I've tested the Plasma edition a week ago and that booted just fine on my Surface Pro 7. I'm going to be installing the Solus GNOME today back on it as I was testing some other distros for awhile as well.
For the best touch-supported window manager, I've found GNOME to be there. Plasma (KDE) tends to work mostly but with a couple minor issues. Budgie isn't really optimized for touch and is harder to use just with touch.
Before I forget, be sure to always use the Wayland edition of any window manager you have so rotation works perfectly, otherwise the tearing on these (especially when rotated sideways) is horrible on X11.
Feel free to message me directly with questions.