I ordered the same floppy emulator that Eric used (all the way from Poland!). Working ever, ever so carefully, I replaced the floppy drive with the emulator, and loaded some of my files downloaded from Disklavier World onto an SD card. After placing the SD card in the emulator, the MX100B now can read and play back from the floppy emulator.
I've attached a couple of pics to show the installed emulator.
If anyone is interested in more details, feel free to message me directly. If the details are appropriate for posting to the whole group then I'll try to cobble something together.
Thanks to Eric for giving me the inspiration to perform this upgrade! I love it!
Scott