CD32 was not even on secondary
The goal was to create a small AA Amiga, so it's not really a CD32 clone, it's Amy's more colorful sister
There is also no real need for the C2P routine in the Akiko IC. The 68030 does this faster than the Akiko can do it.
The Walker had a completely different approach. It has all IOs that a normal Amiga has and a non-standardized board size. No chance to fit it anywhere except in that vacuum cleaner case.
There are only a few expansion possiblities on the Akiko board:
RGB, Network, Clockport, I2C and a frontpanel connector.