It's hard to think of a solution for Loch Lomond. Designating a few sites, providing a log pile, a big bin and maybe a log shelter or two might work up in the Trossachs but at Lomond the fires would just get bigger in proportion to the pile then the shelter would get burnt for good measure.
Good intentions................ but if you provided a big log pile some clowns would use the LOT on a massive bonfire. it'd be gone in one night if the twits got hold of it, as Grooveski says. There's no way those people would be of the mind to ..................Take only a little for our needs and leave some for others...................It wouldn't even occur to them. Well not those sorts of people anyway. Unfortunately nice polite signs wouldn't work on those sorts either...............They simply don't give a damn.