Windows was fun to set up because this particular model had broken ACPI tables such that the only way to get all hardware working in Windows short of hotpatching the firmeware is via BIOS rather than UEFI boot, which surprisingly works fine if you use a the Windows 10 first-stage installer to install Windows 11, which surprisingly works fine because all the first stage does is partition and set up the disk and restore an image, and it doesn't care much about the contents of the image.
This set-up does require maintaining valid GPT and MBR partition tables, of course, and since Windows only sees MBR, it can only see four partitions, which isn't a big restriction in practice so long as I have plenty of free space in a partition accessible from all three OSes, which I do.