In reply to JonmapDL: I bought a pair of Trango S Evo GTX's (the slightly lighter B2 version of what you have) specifically for days out in the Cuillin, and they've been brilliant (though I've not attempted the whole Ridge in one go). I noticed that a lot of the guides in Skye wear them too. They have got good precision, feel and stickiness for the technically harder sections, and are pretty comfortable.
Not sure whether the stiffer build of your boots would make them less comfortable though?
I'd be wary of using approach shoes for such a long day unless they were well tried and tested on such terrain. I've worn 5.10's for a few average length mountain scrambles and walk-ins to mountain routes and found I got extremely sore/blistered feet after a few hours, plus bruised ankles on rough scree descents. No doubt some approach shoes are better designed than others - but some are just over-priced, glorified trainers. Unless you're used to wearing such footwear all day in the mountains, I think there's also more chance of twisting an ankle as well.