By any chance, is any euro(well for a faster shipping, but world is welcome !) owner of a 256 frame, is interested to sell me their 135x9mm dropouts ?
You know these we usually get by default on the frame, and throw away as we will never have to use them
I plan to offer a second life to my broken-seat-stays 256 as a home trainer bike, and 135mm would be better than the 142x12.