Ben Alder is another good example of somewhere that requires a long walk in
from a public road.
This certainly crossed my mind when I first saw your question.
Whilst it is certainly a long walk in by the conventional routes, I had a
quick look at the distance from roads, and was unconvinced that it would
"win the prize".
It certainly seems remote, when you are there, however. I had a session many
years ago in October/November (hind stalking season) at Ben Alder Cottage,
collecting the local Munros.
Having driven up to Dalwhinnie overnight, and borrowed the key to the estate
road, on parking we were met by the factor who said he had stalking parties
out on just about every (alternative) route we had planned (using any one of
the three bothies on the estate).
What looked like being a bit of a disappointment was redeemed by the kind
offer of a lift down Loch Ericht by boat with one of the stalking parties,
and he also extended the journey and dropped us off right at Ben Alder
Cottage. We also arranged the day and time for our return, so he could avoid
the outward walking route for stalking.
I must admit, my opinion of the estate was sky high at that point, improved
further by a share of the whisky flask when we arrived at Ben Alder Cottage.
We had little time to prepare for the boat trip (as they were ready to go)
so effectively threw the whole contents of the car boot into two rucksacks
and took everything - something we regretted when we had to carry much of it
back out, but boy, did we eat better than we had expected, having thrown
quite a lot of heavier, standby food (and some beer) in!
It was topped by a most enjoyable excursion up Ben Alder in crisp new snow
and a complete (mist) white-out, where we were successful in finding the
summit trig point without any difficulty (what's the chance of that on a
plateau like Ben Alder? - my colleague putting it down to superb navigation
skills until I pointed out the potential error walking "blind" on a compass
bearing!
Happy days!