Thanks, cyclistjohn. Let us know how it works out. I'll be interested in ordering those in February or so, so would love to hear some feedback before I do.
Edited to add:
You inspired me to do some more searching. And I also managed to find a site selling 155mm triple ring cranks (of course they're substantially more expensive) in Germany if anyone is interested. About have way down this page.
http://www.hpvelotechnik.com/shopping/preisliste11_e.html