Weird – I was just looking at this on a map last night……
Doing a bit of googling, and with some personal knowledge, here are my thoughts to date:
Glenfinnan to the Streap col should be mostly bikeable, with a bit of a push/carry near the top.
Down to Strathan looks a bit more dodgy. apparently, the path on the West side of the river has fallen away in places, so it’s possible a heather bash down to the bridge.
Glendessary will be fine – although it’s been chewed up and is very muddy in places due to landies/quads.
Mam na Cloiche Airde will be problematic, but manageable.
Sourlies to Carnoch will be OK at low tide, otherwise it’s the rocky scramble TJ mentions
Carnoch to Mam Meadail will be a stiff push up a decent track.
Mam Meadail to Inverie will be a blast.
Overall, I’m 50:50 on giving it a go.