I am not planning a 56MHz A600 version. Something for the A500 is a lot more likely.
Good sunday evening news: The mass-produced version of the ACA630 has one more feature compared to the prototype, which has been proven to work now: The ACA630 can be disabled.
Before switching CPUs with the "disable"-jumper, you need to power down. Just a reset is NOT enough. However, this is still a lot easier than removing that complicated assembly, just to launch a 68000-only-game!