Airpolice route covers it all, but if you don't want to spend a night in Inverness hang a hard right after the Great Glen and head over to Rannoch moor , loch Tay Pitlochry etc. out onto the Strathmore Valley and pick the route back up at Dundee
Edit to add, If you hook up with Fisbangwollop and his mates at Scottish Info I'm sure they'll shepherd you around safely and maybe even help out with some good sightseeing routes over Glasgow.