@miike101 Even if you were to use that bootcamp installation on an Intel Mac with Fusion, you're still stuck with the operating system being a x86_64 Intel operating system which will never run on an ARM CPU. Creating a VM with Fusion from Bootcamp doesn't solve anything because the VM uses the Bootcamp partition as its "virtual disk".

I don't know if any of the upgrade scenarios that Microsoft provides with Windows will handle an architecture change from Intel to ARM. In most cases that I'm aware of trying to in-place upgrade a Windows system requires that the system to upgraded is running, then you run the upgrade installer for the version of Windows you're upgrading to (either from the upgrade ISO file you've downloaded from Microsoft or an installer on CD/DVD/USB) . Obviously this can't be done on an M1 Mac when the original VM is an Intel version.

The best I can think of is save away all the data like you would a physical machine to an external drive. Create a new Windows 11 ARM VM on Fusion 13, install all your applications, then restore all of your data.