@shdwkeeper
It sounds like you are looking for somebody who has done the Win10 to Win11 upgrade on the Designare to respond.
I have done it successfully and it doesn't require special instructions. I suggest you should be using OC 0.7.5. I have macOS, both Monterey and Big Sur, on one internal SSD, and I had Windows 10 on another internal SSD. I did not remove the macOS SSD to update Windows. If you want to be super-safe you might want to.
Running Win10 "Update Windows" I was notified Win11 was available and my Designare was compatible (with the appropriate BIOS settings.) One can run the update right there if one wants to. I actually created a WIn11 installer because I had other computers to update. I started Win10 and ran the Wind11 installer from within Win10. I just let it run and eventually Win11 was installed and running with all my prior apps still there. Win11 is still available as a startup option in the OC Picker.
MacOS and Win11 are now running fine on my Designare on separate SSDs.
It worked fine for me. I will not guarantee that it will work fine for you -- but it should. Make sure you have all the appropriate backups for disaster recovery!