The floppy emulator in your link can only read a single usb flash drive as one floppy. There are other emulators that can format a single usb flash drive to emulate multiple floppies and you can step from floppy to the next floppy on the front of the emulator.
Flash drives are really cheap so the single emulator might not be a bad choice. You could also get a usb extension cabe and fashion a mount for the flash card on your control monitor. I like that option as well. Search the threads here for a descriiption of that modification.
Add USB to front console