I have just seen your post, just back from holidays, - hope you haven't left for knoydart yet!
My experience is mainly with Kilchoan graveyard - where most of my relatives were buried.
Kilchoan is fairly well kept, with many 1800's and later stones legible. It dealt with people from across knoydart i think.
My grandmother, now dead, told me that both at Inverguseran and Barrisdale there were older burial grounds
on small islands I think, but I have no idea what state they are in or when they were used up to.
My family are mainly Mcphails, Mcphee, Mcdonalds etc in Doune, Sandaig, Inverie etc. My grandmother, born 1912, grew up in Inverie/Alltmhoulin/Scottas and I am sure she went to school with some Mcmasters and Stewarts - I'll see what I can dig up!
best regards
stuart