I was wondering if you could theoretically use a windows mixed reality headset with a set of Oculus touch/Vive sticks by using their proprietary sensors and a Bluetooth adapter in the PC to connect them, providing a sort of "mixed" mixed reality.
Nope, you need to use the hmd's proprietary controllers.
the only controllers that are mixable are in wmr.
There probably is a way, but you cant just use an adapter