Good advice here.
I don't have as many iOS and Mac devices as you but I do have an old Powerbook G3 with no USB ports that I wanted get some old files off of. It has a MacAlly USB PC card that I used to use but the card isn't working with the current USB flash drives that I plugged into the card. Even the Powerbook hard drive is SCSI which means I'd need an SCSI hard drive case to copy from it. The built in modem is the old baud modem and the software is too old to connect to internet.
I gave up for the time being.