For that purpose, I've been looking for a cheap alternative and a few days ago it suddenly showed up: a Superia Gemini Cross, real old school cyclocross brand, nice steel frame, some usable components and... exactly my size. I hope that things work out well and in that case I can post more details within a couple of days.
Steel frame 58 cm (EDIT: it's a 57cm, but that will do), wheels with tubular tyres, single chain ring with guide plates, Sun Tour bar end shifter, Dia Compe cantilever brakes, toe clips and straps, etc. And very affordable, too!
