Hi jonssonj,
All of the Blizzard cards I have seen all had
the CPU(s) mounted directly to the board.
Anything is possible;-), you would of course
have to remove the old 68k chip (and install
a socket), change the voltage to 3.3v and
possibly modify the clock freq.
The hardest part may actually be sourcing a
socket for the 68k...they seem to be hard to
come by for some reason, especially if you're
not buying 'bulk'.