I would have thought it would be easier to send you a "Don't Do"
Dual-Boot is a classic case of false redundancy.
You only get ONE BOOTLDR with a windows computer. However many operating systems you have even if you put all your OS installs on seperated drives, ONE.
and if the one drive with BOOTLDR fails you lose ALL your operating systems.
Frankly I prefer swapping system drives like Atari cartridges than "Tangle them" together with a Dual- or Multi- boot setup.