guyystAfter fiddling around with it a little bit I got this working on Windows 10 Technical Preview so I guess it's gonna work on 8 as well, considering that the tutorial wasn't for 10.
Though aside from the (imo)overall worse look, which is the result of removing DWM, there are quite a few bugs, at least on Windows 10.
I mean this technically works, but I'd much rather like an actual fix of how DWM handles multiple displays :/
Well, the guide did mention quite a few bugs even on 8, including a broken login screen. Either way, it's a workaround, but I'm glad it actually does work. This is really promising.