I finally found a solution: Fully functional control panel without MS store and bloat working with dch drivers!
You can just use a different install's nvcpui.exe and it will give you a functioning control panel for the up-to-date (dch) driver.
I found this by desperately searching for the dch control panel after installing 511.79 with nvcleanstall on a my stripped 21H1 and ended up executing the nvcpui.exe from my Windows 7 install on another drive (which has 441.41 installed lol) - and it just worked.
Can just copy out that nvcpui.exe (and possibly the .dll file there, too), place it somewhere on your C drive and use a shortcut.
If you don't have a different windows/nvidia install ready, just downgrade to the last standard nvidia driver, back up the nvcpui.exe and the .dll and use those after you updated to the newest dch.
If someone sees an issue with this, please let me know. So far everything seems to work as usual.
Not sure if this works with ANY nvcpui.exe as I can just confirm this working with a 441.41 Windows 7 nvcpui.exe - but I'd assume it's generally applicable.
So the 441.41 nvcp seems to work independently and shows that version 511.79 is installed. It has the 5xx features, like shadercache size, too.
Feel free to test whether all (also dch) nvcpui.exe's work independently for any driver version!