Thanks everyone for your constructive criticism,
suggestions and, in some cases, snarky yet ignorant babble.
I've decided to cover the entire undeveloped area with mulch.
That way, my friends will see that any further contributions
will be immediately visible. Hopefully that will be sufficient
deterrent. I can temporarily shop vac up a spot of mulch
and continue to use my post-hole digger to lift the clay
into a nearby bucket until the hole drains itself.
Deposit mulch in hole to surface, rinse, lather, repeat.
At some point in the distant future, I'll rent a tiller and
combine all the goodness.
--Winston