Replacing A Palm's ROM With An EEPROM?

^me^ asks: "I have a Palm IIIe and an EEPROM burner, plus numerous EEPROMs and I can get them manufactured. The Palm IIIe uses a ROM to store system software, and I'd like to upgrade it. Is there any way if I map the pin layouts or something that I can replace the ROM with an EEPROM?" Could a Palm's internal memory space be increased as well via a similar hack? Palm VII's could really use the extra space.