Found a Sharp website where they are offering Picsel Browser for Zaurus for sale on a 256mb SD card
https://store.sharp.co.jp/html/SLP/picsel/Google Translate did an excellent job translating it. Speculatrix and Jon_J, we have our answer on why it will only work on the SD card that it is shipped on......
"This software is designed to operate only with the SD memory card that was shipped at the time of shipment using the unique ID of each SD memory card. (Although it is possible to back up to other media, it does not work.)"
So who knows to spoof an SD cards id? I have a Panasonic 512MB that we can use for testing.