Well, you can, but it is going to be complicated. The real question is, why would you? Most people do this by buying a single worthless cartridge, and then desoldering the ROM chips, replacing them with EPROMS/EEROMS or something similar. There is no need to have an active calculation unit (read: microprocessor/microcontroller) since the chip will be addressed like external memory.
I guess I had in mind multiple games and not sure if u could take advantage of the the expansion bay and maybe live date I am really not sure all of what u could do mainly to play games like an everdrive though
