To my knowledge, the CD32 expansion bus is unlike any other bus used in other Amigas. Although its 182 pins are fairly well documented it would still require a custom solution.
I have no idea who owns the rights to the various sx32/pro designs but Im pretty sure we wouldnt wanna have somethings thats just a new batch of old hardware. Realistically, 040 cpu designs are not likely.. neither is a FPGA design. The most likely scenario is that individual computer would produce something similar to aca1230.
Not sure right now how the Apollo team is approaching new hardware. The core they have atm is a scaled down version made to fit in majstas chesp fpga board. 1200 or cd32 versions will require some investments.