Separate battery powered would not be a problem, and yes payloads are small, but prob still need sd card slot/shield to store payload, Really not sure if usb from arduino to usb-c switch would communicate/ work
Oh shouldn't even bother tho, by time got all the materials, arduino w sd card slot, battery, usb to usb-c cable - I could just buy a RCMLoader for alot cheaper for $20 ebay, was a thought tho