In reply to Barnacles:
No replies? here are some suggestions roughly along that route for bouldering (I have a serious allergy to rope!)...
Laurenzoboulderfels (not quite in germany) or Pfalz
Zillitral
Val Masino/ Val di Mello
Annot
Albaraccin
Well worth diverting to magic wood in Switzerland if you going down that way....most of them also have mountain or sport routes nearby...
Have fun....