In reply to Frazer:
The Swiss Alps are full of great PD to D ridge routes on 4,000m peaks. Have a look at one of the 4,000m peak guide books such as the Martin Moran AC guide. How mixed these routes will he will depend on conditions - potentially quite snowy as there was snow to below 3,000m recently, in Cham anyway, though some of this will have burned off. Ask at the guides offices, eg Zermatt, Saas Fee, Grinelwald. These are areas well worth exploring. The alpine conditions page here is also worth a look. The forecast doesn’t look too bad either.