Windows is a showstopper itself. It might play nicely sometimes but it isn't a workable solution. I can no longer ever try dual booting because it doesn't respect anything but itself. It'll just decide to get rid of other bootloaders at its own discretion.

I'm talking about dumping the subsequent bootloaders such as GRUB to a file located in a Windows-accessible location, and then adding a menu entry for Windows Boot Manager to chainload into it.

As far as I know, Windows doesn't just overwrite the BCD like that unless you explicitly tell it to.

Also, obviously the assumption is Windows isn't a showstopper such as in my case. I'm inquiring if there are any practical or technical concerns that would preclude using WBM as a shim.