I got tired of the cars being unmovable up on jackstands. I put the adapters and Camaro wheels back on the coupe and put the S10 rims with almost-new Corvette tires back on the wagon. The Craigslist tires are sketchy but hold air, and I am not worried about the sidewalls going any further bad in the sun. The wheel adapters are a mixed bag. They would have been ideal if they were only 1-1/2" thick instead of 2". I could go to a wider tire and clear both the frame rail and the fender lip.
It looks like I may need to swap the wheel studs on the S10 unitized hubs - I'll need a bit more meat to feel safe. The M14 lug nuts that came with the adapters have a smaller shoulder than the stock 5th-gen Camaro lugs, so that will need to be changed before driving. Now if I could figure out where they got stashed...
In the process, I also moved both cars over on the driveway to make the wife happier. Now she won't tag the mirror anymore as she walks by. Who needs a gym membership when you can move four tons of iron with a floor jack and a pair of wheel chocks?