In reply to alps_p:
If its pure rock you're after these are few and far between, with the Lagginhorn, Schreckhorn and Zinal Rothorn the stand outs.
But there are quite a few others that are predominately rock with some snow or mixed sections (depending on conditions), such as the Alphubel (N Ridge only), Dent Blanche, Rimpfischhorn, Taschhorn and Wiesshorn .
The Martin Moran guide ('The 4000m peaks of the Alps'), sets out all of your options on these peaks (although many of the best or most classic options are only AD), but happy to discuss in more detail as I'll probs be out there in September looking to do the same sortta thing..
Just a note on the Zmutt Ridge; its very prone to rock fall late in the season so typically needs upper snow cover for it to be safe.
John C
Post edited at 16:29