Feb 6, 2018 - 4:01 AM
MJS-- In Switzerland, for the Via Alpina, you've basically got the Green Route and the Red Route (plus a bit of the Blue, but will ignore that one). It sounds like you've done the climax part of the Green Route already, so that leaves the Red, which is done a lot less and hard to research. (I haven't done it, but have looked into it pretty extensively.) The main issue I see with it is that it seems to follow major road systems for a good part of the way. Am also not sure it will satisfy your high altitude requirement.
If you drop the condition that it be Via Alpina, you could find some nice country at altitude in the Mischabel and Zermatt areas, and of course there is the Haute Route, or some part of it, to consider.
Watch out for late snow conditions this year, due to the epic snowfall this winter in the western Alps. Might need gaiters and ice axe for some trails, unless going in late August or Sept.