One thing I’ve been trying lately that’s a bit different: I happen to have an old SSD that had an enclosure with it (kind of like this) which essentially turns it into an external USB drive.
I then used Rufus to install Windows on that drive, using the “Windows To Go” option and also checking the option to not allow Windows to access the internal drives. That way, my laptop can just happily run Linux by itself, and if I need to use Windows for anything I can just plug the drive in, hit F12 on boot and choose to boot from that drive instead. The added bonus is that Windows also can’t mess with anything on my regular system or monkey about with the boot loader.
I’ve only had it on there for about a week but it seems to be working perfectly fine so far!
Oh and also Rufus gives you the option to start with a local account already set up, so you don’t have to do the MS online account bullshit. And then after install I used ShutUp10 to turn off as much telemetry as I could.