catmother,
You could use a dedicated boot partition, I prefer grub, to hide partitions and boot all but the Windows install. The Windows boot loader could hand off to the grub partition and you could select the other installs from there.
The problem I see with the whole thing though is why go through all the gymnastics just to use some part of the Windows boot loader? I see it is an academic exercise with little practical value. But maybe I am missing something.
Fred