

Yes 100% this is the problem. You can even add a redirect to Grub / systemd-boot to load the Windows bootloader from the other drive example for systemd-boot.
Does not work with bitlocker though without diving into very advanced settings to control which events are considered insecure so the tpm releases the keys.
Since I am behind CG NAT I try to use IPv6 for most things at home. It works pretty well most of the time. Also a lot of Software (or should I say games) that claim to not support ipv6 do, as long as you can give them a domain that only has AAAA entries…
SLAAC is pretty cool if it works and if you can weed out all the devices with privacy extensions enabled by default, so you can properly apply rules…