Ditto for headnet. If you had to fix a puncture when they were swarming, doing it without one would be pure hell.
Otherwise the route is lovely, some of the roads are a bit busy, mostly with camper vans, road surfaces mostly good, for UK at least, I enjoyed getting an early start when the roads are quiet.
Some of the shops are not that well stocked, eg the spar at Durness was out of sandwiches and almost out of bread by mid afternoon. I ended up making my own sandwiches a few times as there wasn't a lot of ready stuff (might be more options if you eat meat).
I've got a Google sheet of shops and opening times if useful:
'Long version' down at the bottom is similar to your intended route