jef, I guess you'll have to do a bunch of searches and adding up the costs of parts and tools.
Eh, at $30ish each, it really isn't worth it to rebuild this one when I can buy new around $100 and used well under that. Tools are negligible, I will eventually need them for my other newish bikes, buy now or buy then is pretty much how that goes. Plus, I was already looking for a triple to go on the wife's Euro touring bike, so she has some sort of bailout gear, I can transfer this over there. Before anyone wonders why I need low gearing and she doesn't, I don't really need sub-25 for this trip, just getting it setup how I want it to start out with. She was mostly fine with the 52/42 in the NL, the 30 should get her the extra boost in any sort of hills. Shes got a couple other bikes she rides in America, this is solely her "scared to get a nice bike stolen in Europe" option.
At least, I really hope we don't need lower than 25GI for a river canal path