But because Eyetech refuse point blank to bring the custom chips
(probably because Gateway have raided the IP),
Heh. What a vivid imagination you've got there...check out the Google archives of Dave Haynie posting in csam (you know who Haynie is, right?) and take a gander at his words on reproducing the custom chips.
Also, despite what some people think, NTSC or PAL timing-locked raster interrupts do not a great chipset make. Once upon a time, maybe.
Live with emulation, or buy yourself a pallet load of A500's and A1200s (unexpanded, of course...just about the only rigs that'll run that nasty hardware beating junk).