I used this [https://www.easyuefi.com/wintousb/] to create a bootable USB Stick with Windows and use it with my MacBook Air for years now... even though I boot it like 5 times a year. Apples Drivers for Windows (you can get them from Bootcamp) are superb in my experience.

Looks like a real deal, thank you. mind if I ask you what your card was and what your speed experience eas?

I use a SanDisk Ultra Fit 128 GB ... As I am using it only occasionaly I did not do any benchmarks. However I would say it is fast enough to use it on a day to day basis. My colleague uses the same stick with his Lenovo machine and records and cuts 4 hours of podcasts every week. We are both very happy with our solution and like the idea of „pulling windows out“ of our machines. Bonus: You can backup/restore quickly by doing images of the card in your main OS.

You can do it with FlashBoot Free (no VHDs required): http://www.prime-expert.com/flashboot/