An EOMA-68 card which contains an FPGA rather than a CPU.
All the EOMA-68 pins will be wired to the FPGA (depending on the capacity and capabilities of the FPGA chosen).
The CPU that can be built on an FPGA is unlikely to be as fast as a SoC, however it's a good target for
Ideally an FPGA would have a publicly described bitstream format, internal structure and have open source tools to program it; however I don't think there are any that meet those criteria ? (lkcl: there's one which i found when researching the zynq 7030, look it up on the arm-netbooks archives).
We would want at least one that has free (as in chocolate) tools, that can run on a free (as in code) OS.