Well, I agree that modifying a MacCon is not an especially good idea, so looking at it again, I have a) ordered some gear from macmetex and B) pm'd trag re. the availability of euro-din connectors in his stash. You never know.

They are no longer on digikey from what I can see, though they do appear in a handful of manufacturer catalogues. What I fear is needing to order a minimum of a hundred.