bluetooth headphones

It should work. I've paired 4 different Bluetooth Headphones with my Apple Watch.

The hard part is figuring out how you put the headphones into "Discovery" mode.

But once you have the Headphones in Discovery mode, it should show up in Apple Watch -> Settings -> Bluetooth and you then should be able to select the headphones to finish the pairing.

Maybe this will help

https://www.bose.com/en_us/support/article/pairing-the-headphones-with-your-device-soundlink-oe-headphones.html