Its not too difficult to have an alternative arrangement, the weather is so variable up the west coast. Getting to Oban isn't to bad, if you have to get the ferry from Kennacraig then its fair shack down there from Oban.
On the easiest way to Oban, you'll go through Tyndrum; left to Oban or right to Fort William. The latter takes you through Glen Coe which is fantastic, hang a left at Glen Orchy for wild camping and then back onto the main road to FW. You could then tramp up to Mallaig, short ferry to Skye; ace camp site at the head of Dunvegan Loch ( the castle isn't to bad either - the clan MacLeod) ....bridge back over and onward ........plockton...applecross........
if you go to Islay, you might all not want to come back!!