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I'm not sure what problem you are encountering exactly, but switching to another virtual terminal might still work. By default, the virtual terminals are linked to the F1-F8 keys, and the combo to switch from a graphical session usually is CTRL+ALT+Fx.
On that other virtual terminal, you might be able to kill KWin.
Not in the way that Windows does, at that point your best bet is SysRq+REISUB or SSH in and kill kwin and possibly issue a manual reset in /sys. But even if successful, half your apps will have died as Wayland compositor handover isn't quite reliable yet.
I also believe if the GPU hangs the kernel already tries a reset, I would start with a manual reset via SSH to confirm it's even worth pursuing and then you can figure out a hotkey situation. Even if the GUI is locked up, you can listen to evdev devices and catch an arbitrary keyboard shortcut and run a shell script that resets the system to your liking.
REISUB would sync all remaining disk operations and then restart the entire machine.
You could try the old combo for restarting X: Ctrl+Alt+Backspace. I'm not sure though, whether it will work on your system.