It occurs to me that my idea of using 68k copros is just making everything more than twice as complicated.

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More importantly, it makes it too expensive.
The very first thing we need to look at in any concept is the cost per unit, I think. / 68060 and 68040 are also too expensive

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What I meant here was using the existing '030/'040 CPU from the host Mac and providing a socket for it on the upgrade, or, if the upgrade is in the PDS socket, some other way of trapping non-Coldfire instructions and shuttling them back over to the host CPU. Run compatible instructions at Coldfire speeds, and what's left over at '030 speeds.

So the issue of cost of the 68k goes away, but the extra complexity remains.

I'd say we're better off just going all the way back to the emulate the 68030 in an FPGA.

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Agreed.

Again, apologies for waking the dead.