Unfortunately I cannot follow this method. My MB has not integrated WiFi and I've already engaged both M2 slots with a couple of disks, one for MacOS and the other for W10 (I use a dual boot system on my iMac19,1).
I see there are also mini PCIe cards. I could exploit these free slots, but at the moment I'll try the Fenvi card I already ordered. Handoff and sidecar are not so essential for me. It's only a wish to reach a system as perfect as possible, let's consider it a whim!