But since there is no universal app used by all those users, you find yourself crafting 2^n procedures.
-> Since that's far too many, have you considered the old fashioned browse the DCIM folder and copy what you want out method?
I am looking for a universal way to import pictures and video from an android device. The Windows Import is too invasive. It will import everything, (including thumbnails) then delete everything if I want to make room.