Issues to change startup disk through Win10

Hi there,

I have an issue to change the startup disk through Windows 10, I'm using the most recent bootcamp version.

Well, I can’t find the bootcamp settings on menu bar to startup disk with another OS (OS X El Capitan).

I can’t start pressing Option button because the system doesn’t recognize the Magic Keyboard.

I tried change it on msconfig but doesn’t appear the OS X partition.

Is there another way to change the startup disk inside the Windows 10?

Thanks,