In the absence of favourable conditions to enable this route to be walked I am planning to go south via Tarbet and Kinniskaig to rejoin route east of Finniskaig. There is an indication that it might be acceptable to take ferry to Tarbet from Mallaig. The only scheduled service does not get to Tarbet until 15:30. However a private arrangement might be possible. If anyone else is interested in this option please let me know

If you want to get to Tarbet the best way would be to switch your start point to Morar and walk, probably quicker than waiting for the ferry anyway and I'm sure Sue & Ali would not mind in the circumstances.