It seems I was on nearly the right track.

My thoughts were shelter stone, Avon refuge but stuck continuing to Ballater. How do I link up with the river Gairn and into Ballater on your suggestion? from the fords of Avon...
If we go to Hutchison hut & Derry lodge, (Lairig an Laoighit from Avon) seems we will need to track north east to find/follow the Gairn to river Dee into Ballater, (Clais Fhearnaig) - that goes south side of Beinn A Bhuird but still leaves a far way north east to Gairn.
So go around Ben avon south side to Gairn from derry lodge or go north of Ben avon from the fords of Avon?

Glen feshie will be the FWA I imagine.

David - formerly known as D & A :)