Hi,
no there isn't any way to get araound this.
The Bridgeboard needs some memory space from the Amiga side
for the emulation.
The Zorro-II-space is only 8MB. If your HC+8 holds the full
8MB there is no space left for the emulation.
Here is the memory map of the A3000:

The right part schould match the A2000 memory.