I've considered this for consolidating core hardware, but dual-boot doesn't do trust boundaries well. The Windows kernel still has full block access to the other device, so if it gets admin-level malware, it has free rein to infect the other system. At one point several years ago I got partway through a plan involving having most disks be externally pluggable (and assuming that firmware-level malware persistence is unlikely, which I'm not as sure about these days) but gave up for unclear reasons. I think if I were to try that again (and if I had the hardware for it) I'd try some kind of NAS approach to separate storage credentials from the OS.