How I did it...use BlizKick.
This is a ROM kicker which you can set up to run modules...one of which is BlizFix040 - or something...this removes the old 68040/060 library from memory - which IIRC is put there by the ROM in the Blizzard. This is what is giving you grief.
It did take quite a lot of messing around to get this to work but just read and re-read the instructions on getting BlizKick to work and you'll get there.
HTH
Allen