I think choice is better than nothing and this provides a new path.
Personally I suggest to Jens:
1) since the built in chipram is faster than on the original AGA machines then a CPU board with just the 020ec and no fastram can be another compelling options for people interested in just a game machine.
2) if possible, implement all the glue logic in a small CPLD or FPGA. This will make design and bugfixing faster and will permit to people to contribute and experiment with the design. I appreciate there are possible concerns about people returning their boards after flashing broken custom bitstreams.