The sizes of nor flash chips you would want to use aren't available. The 161in1 C/V roms use F0095H0 which are 8Gbit. If you google for 8Gbit nor flash the likely only hit you will see if a press release from a long time ago. Most manufactures seem to top out at 2Gbit, which would mean having to have 4x the number of chips. Its also asking a f-ton for someone to design 2x cart PCBs (4x if you do both AES/MVS), a number of flash PCBs and a number of adapter PCBs needed to adapt the flash PCBs to a programmer.I wish I knew, but that is beyond my knowledge about these things.
I remembered that the Fujitsu MSP55LV100S is not stocked anywhere, so I wanted to know what's your opinion about creating custom pcbs with connectors that make the programming process easier than de- and re-soldering (and also eliminate the need for sacrifice carts).
If that's not an option, please ignore this n00b question.