I am surprised to hear there is no one in china already producing 68000 chips since I think I have seen some toys with "16-bit graphics" that resemble some sega genesis games.
The chips are useless for MiniMig. Made by Radica they use a custom ASIC just like the C64 DTV. The 68k is deep inside the ASIC and it is unlikely that all the signals we need are on pins.
http://www.radicagames.com/playtv-legends-sega-genesis.phpBen Heckendorn converted one into a hand held genesis, you see he mentions that it is only one chip (GOAC)
http://benheck.com/Games/Sega_projects/Exodus/Exodus.htmWhy he did this I dont know, as the Genesis/Megadrive has a great official portable called the Nomad!
The 68k remake inside the Genesis/Megadrive DTV must be pretty compatible... I wonder who created this? And (assuming it's not Sega) if they are willing to share the HDL ;-)