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I made a ghastly mistake. I hit the wrong key and purchased a Pi Zero instead of the Pi Zero W that I wanted.

I have a wifi dongle, but I can't attach it and the keyboard at the same time. I tried an old USB hub, but that didn't work. I suspect it's due to insufficient current.

Is it possible to edit wpa_supplicant.conf without the presence of wifi hardware and expecting it to work when I attach the wifi dongle later?

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You can obviously NOT create a wpa_supplicant.conf interactively, but you can make one manually - even on a PC.

See How to set up networking/WiFi

PS You would probably find the Pi Zero W rather limiting - it is well worth the few extra bucks to get a Pi3

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