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Or, you could use the right part and not need a little adapter board: 
Of course, they probably don't make the STK16C68 or STK12C68 in DIP28 any more... I haven't looked. This chip was from some leftover stock I've had for several years. You can also use ZMD U63764, which I know are long out of production. But I'm sure you can get the Chinese to scrounge up some pulls.
You probably don’t need the cap with the STK12C68 here, but since you have to make the adapter for the SMD part anyway, you might as well include it. Cheap insurance.
Yeah, I doubt demand will be very high. The lithium coin cells work well, and are safe. Mine still had the original cell, and the voltage was still solid (measured 3.2V). Only reason I installed the NVRAM was because I was curious, and bored. 
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Derry, NH