So we are looking at an overall grade of 1.6% or so. So looking for at least a 3.2% or so if going uphill and downhill is similar length. But more if poss but few flat bits in between.
Yeah, I can get clusters that are steep enough:
Loch Tay and Tummel (Giola Dam road, Schiehallion, Ben Lawers, Glen thingy from Kenmore, Griffin, Errochty)
Central Mounth (Cairngorm Ski Road, Bridge of Brown, Lecht, BHs)
West Highlands (Mam Ratagan, Claunie, Stromeferry hill road, Bealach Nam Bó, Diabeg)
Ardnamurchan
But linking them together is huge expanses of "nice" shallow Straths.