SuperMiniMig3.0 & TG68

Not heard of this.
I figure since no one wants to actually build and sell accelerators for classic machines anymore, one of our talented PLD guys could at least come up with the design for one.
Someone is/was designing an A600 accelerator. Jens Schoenfeld was one. Some guys over at EAB were others.
A 250MHz 000 core has to be an improvement over a 25MHz 040.
You cannot get an FPGA today (at an affordable price) which could run TG68 that fast. And even if you could I doubt it would be as fast as a 66MHz 060.