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I've seen some doubles adapted into triples by drilling and tapping extra holes in the crank spider. However, you can tell they're conversions and not proper triples - on the proper triples the fluting on the spider is shorter so that it stops before the hole for the granny ring, whereas on the conversions the hole for the granny goes through the end of the fluting. I think it would be quite easy to do, particularly if one had access to a milling machine and rotary table (like wot I do). Trouble is, I still want the proper, genuine triple. And like you say, they're a bit pricey...
Brommers
i so want also, this is currently reaching 200 euros,would be complimented by the campagnolo rally rd with longer cage, i sold some parts to a gent who turned up on a mercian, and he had made his own, he said you have to get the drill hole right on the crank arm, and make the spacing for the 3rd chain ring the same as the 1st and 2nd, i asked him for pics but he said he's camera shy and i should go see him