This is very much the opposite of my experience, M.2 Wifi modules are very standard, cheap and solid. All my motherboards have one installed for the wifi and it

This is very much the opposite of my experience, M.2 Wifi modules are very standard, cheap and solid. All my motherboards have one installed for the wifi and it's trivial to swap it out. I have just replaced it when it stopped working or I wanted some Wifi/Bluetooth spec it didn't support. The Intel AX210 is the most recent one I've used, but I assume they'll release a WiFi 7 version. M.2 is just PCI-E at the end of the day, so should be entirely viable to adapt one if something didn't have an M.2 A-key slot.