I disagree that it is reasonably fixable The crinkling of the steel rim and the significant flat spot created means that it will never be in acceptable condition, and steel rims are much harder to get back into shape than aluminum anyway. If you damaged both wheels to anywhere near that amount I would unfortunately say the bike is totaled, as the cost of two wheels exceeds the value of the bike. As you are not going to find anything but a very old used wheel that will accept a Uniglide cassette you would have to purchase a rear wheel and freewheel, and the cost of that alone may even exceed the value of the bike.