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I did something similar a few years back when I was tech inspecting some cars for a series.
Was quite easy as all the cars that I had to check were DOHC engines,
mainly Mitsi Evo's 4G63.
I cam up with the theroy that how much extra capacity go you go with a standard stroke?
Answer was not a hell of a lot, and all I was trying to determine was which engines were 1800cc, 2000cc, and which were 2.2/2.3L.
You couldn't bore an engine far enough on standard stroke to make one into the other, adn so all I measured was stroke.
So I made a tool that screwed into the sparkplug hole and had a 6mm hole right through it. With a 6mm rod dwon the centre onto the piston found TDC and BDC and measured the difference to give stroke.
I measured those that were complaining and those who being complained about, and when both measurements were the same it ended the arguement.
So you originally stated within 10% accuracy,
maybe a similar method may work depending on what engines you have to do it on??
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