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.....I could just ream out the chambers to the normalized version, but I like to leave my collection as they arrived (unless something is broken.)

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I understand. But I think its important to make the gun usable for my own and future owner's use. Here is what I did for a cape gun that had a chamber in a German 11.6x82R caliber. I ran a 450 bpe reamer into the chamber so normal 450 bpe ammo could be used. This would be the same for the 11.2x72R "D" chamber. Only the middle of the chamber would be "Normalized" and you could still shoot "D" cartridges if you wanted.

http://www.buckstix.com/buckpics/old-new-chamber.jpg