Hello
Well I'd be interested in a simple experiment - removing the J3 strataflash (16 Mb per chip) and replacing it by greater chips (say min 32 Mb each, or even 128 each !) to boost internal storage.
After that, a new bootloader would have to be installed by JTAG. If you feel like trying I can check the chip reference. Finding/soldering the chips could be troublesome however.