Entering very long Google password during setup
Well technically I don't think you need to actually setup a Google account right away. So what I would recommend is skipping the part of the setup process where you setup a Google account and then use a built in app to retrieve it (SMS, copy a file onto your phone or any method to read text).

Other than that I think the best thing would be to just temporarily change your Google password for a few minutes, than change it back right after (once you have methods to get the new password onto the phone without typing)