Have you tried Rufus? If you have the iso it will burn it to a usb stick and make it bootable.
Or if you want a bootable windows 10 stick use the Windows creation tool as it downloads, copies to the usb stick and then makes it bootable
Thats a pain, does the below link help? Steps on using boot camp assistant with your current iso.I was going to say the same, but neither run on a Mac afaik