After a closer look, the answer seems clearer.
Even without the axles, they weigh 800g. Not horrible, but not great either. You can fairly easily build a clincher wheel of metal that weighs less than this. A tubular wheel, extremely easily! And on top of that, they take freewheels which are often, but not always, heavier than cassettes!
So, for me, it's not really worth it.
Also, inspected them in better light and found this. You can stick a penny in that crack. I'm sorry but No Thank You.
Does anybody want them for the cost of shipping? To use on something that's Not A Bicycle? Happy to include the axles or I could remove them if you're planning on running quick releases and attaching them to a normal bike. Could also put them on a trailer or cart with the stub axles they have now. There are literally thousands of uses!