Would like to be able to disable specific onboard nvme storage as means to dual boot without risk of one system writing to the other.
Can you full disk encryption on both SSDs and use different passwords?
i would love to see something like this. even with full disk encryption windows tends to fuck up my boot loaders / efi partitions when arbitrary updates get installed.
+1 from me too. Windows likes to screw up boot loaders 
. Physically remove the nvme drive is very time consuming because it under the mid plate
This may not be possible without hardware support for it. Ideally a switch on the io plate of the motherboard.
I am fine with any simpler solution than half disassembly the notebook.