In reply to Kid Spatula:
Schoolhouse ridge above Ballahulish is a good option in iffy conditions. Need to consider descent though.
E ridge of Beinn a Chaorainn is generally considered a "safe" option in certain poor conditions, but I do know someone who was avalanched on approach in poor vis. Likewise approach to Carn Dearg Meadhonach can be problematic.
Golden Oldy on West Face on Aonach Mor is often worth a look- but make sure you do your first visit in good vis as its a tad confusing.
Basically there is no one simple safe route... but you have the right idea going for ridges and there are certainly some smashing ones in the area.