was hoping something else might have come along
Well, yeah. Adter the Days of DOS lots of things came along so that upgrading DOS was not worth the effort. Now we have more hardware and more FREE software than before.
We have other kins of flash drives. You could get card reader that will work in a MS DOS machine. Not a USB device, but a flash card reader.
And why do you HAVE to use DOS? There are free OS that can do the job. Does the system have a Hard Drive? Does it have a CD-Drive?
Is this a old system with only a floppy and a couple of USB ports?