I Of course the engineer who designed the bell housing attachment was clearly a Bond villain.
Sneaky trick here- - - - -use about a 3/4" or 1" diameter hole saw and poke a few holes in the bell housing adjacent to the clutch bolts you can't reach. Then use a universal joint socket to remove the bolts. That just leaves a few "clutch cooling holes" in the bellhousing, and it can be reused. You can even plug the holes with rubber expansion freeze plugs if you choose to do so.
Jerry