I hate to shoot down your daydreams in midair, but unfortunately this is all pointless.
Even if the development would cost nothing and the software would just fall from a tree it would still be not worth it as it won't accelerate the Amiga as much as you might think.
You should not forget that the rest of the Amiga can not really cope with a "limitless" faster CPU. In fact the existing 060/PPC accelerators are already pushing the limits of the custom chip architecture.
The only Software that would realy take advantage of a mega fast CPU would be software that mainly makes calculation but does not have much graphics our sound output. So you are stuck with numbercrunching software like raytracers.
3D Software will not benefit much from it, as the (fast) calculated data can only be displayed quite slow.
Same goes for Video editing software....
