If you fly up there you'll still need a car unfortunately as some of the distillerys are a fair distance apart, a mug is needed. I had my nephew.
I agree, the ferrys are a bit baffling. We went from Tarbet on the mainland to Port Askaig where we spent the night and then gradually made our way down to Port Ellen where you can again get the ferry back to Tarbet. That should suit whoever is the 'mug' as Laphroaig, Lagavulin and Ardbeg are all within walking distance from the town.
If you fancy that route when you arrive back at Tarbet it's only a short drive to another ferry port which I can't remember the name but you can get the ferry to Lochranza on Arran. Again just a walk to the Arran distillery, completely different taste to an Islay whisky but great selection and well worth the visit.
TBH it is a bit of a ball ache to arrange but definitely well worth it.