As I said, I tried all of this, and after it loads the DUSE driver, I get an error:
"Please specify the location of COMMAND.COM."
It happens whether I use DUSE or any of the other drivers listed on these pages that you linked for me.
COMMAND.COM is on the diskette. I see it there when I look at the diskette in Windows, or in DOS when I boot without the DUSE driver. It appears as though the DUSE driver makes the USB floppy drive unreadable.