Any other ideas welcome. One road bike idea I have nursed for a long time though is a "The Grand Tour of Lochaber" on a day ride. Glencoe, Corran Ferry, Loch Eil, Loch Ailort, Glen Uig, Acharacle, Salen, Strontian, Corran, Glencoe. 101 miles if you deduct the Ferry crossing and many thousands of feet in ascent, although not the 29,000ft shown on the profile I hope as that cant be right! Folk could just ride along with me on sections to give support or maybe go for it themselves.
Give me some feedback if you would want to join me on a section or sponsor or support me. No date set but maybe mid to late September, but open to other dates if others want to come along.