Im tempted for a summer trip up there next year. Is the recumbent suitable?
Yes recumbent is suitable.
Safer on single track roads IMO tho’ there are a few blind corners which can be dangerous. If possible I wait for a car to go and follow so I have a reasonable expectation of a clear road.
Warning! There are some pretty steep hills so low gearing is desirable on Mull.
Ardnamurchan is similar with a killer hill on the road to the lighthouse plus a lot of short nasties towards Strontian .
At least one rear view mirror is essential to allow slowing in ( or opposite) a passing place to let following traffic overtake. Keep left unless for a very large vehicle.
There was an idiot on a recumbent trike a few years ago who would not stop in any passing place and had over 20 vehicles behind him. He was eventually forced to pull over by a public spirited motorcyclist and was last seen shaking his fist at all the passing traffic. I remember he was a TV producer.