Dear Dmitry and the List,
Don't know how far you want to take the search, but you might want to widen the net a bit and try the classic balloon-tire bike sources at CABE (www.thecabe.com). Those bikes also used thin butted spokes (mostly galvinized, but some chrome-plated) just like you are searching for. The longer lengths you need might be considered useless for those folks - but just the ticket for you.
Another DT distributor to try is Paceline, in CA.. They are wholesale only but they keep a huge amount of spokes in inventory and I'd be surprised if they didn't have the 15-17 Revo's.
Finally - a shop with a Phil Wood spoke machine is a godsend for adapting / shortening spokes of the right gauge / wrong lengths. If the cost isn't outrageous, sometimes the best strategy is to bite-the-bullet / step-up to the plate/ and get em' set and be DONE with it.
Good Luck,
Mike Fabian
San Francisco, CA USA