Well, for the time being, it's gotten a 'Farmer Repair'. Bought some 10 Gauge steel plate and plasma cut a 7" disk. It got welded to the inside/mounting surface of the wheel.
Rather than locate the bolt holes inside the roached out holes (yes, I inadvertently ran a day of mowing with lug nuts that loosened up), I went in-between so the bolts and lug nuts would help hold everything together (along with the welds).
Sooo, I'm back in business. It may not last as long as the Walker, but it will get me through the rest of this season.
John