In the past there were plenty of cards which worked on ALL 68k based OCS Amigas A500,1000,1500,2000 that just slotted into the CPU socket.
I don't see why you can't take the A600 accelerator card and just re-jig the layout of the pins to the original 68000 CPU layout and just put the pins on the bottom and a 68000 socket on the top.
It would cost very little in design terms, and that just leaves manufacture. And if you design it properly so that it fits in the A1000 too (CPU socket is close to the side of the machine IIRC) then it's all viable.
The one's on ebay are all bollox '32bit FAST RAM daughter board not included' which makes them useless despite being 25mhz 68030 cards. Without FAST RAM you get no real speed increase so for me the issue is not cost it is effectiveness.
I would love to purchase 2 of these boards, one for my A1000 and one for my A2000. Many other people would instantly purchase such a thing.
I wouldn't purchase it for my A600 though, it's not Indivisions fault, it is Commodore's fault for making the A600 such a cheap piece of tat to use compared to the A1000/2000 I own
