Nationalism wasn't really a concept in a period so it seems rather bizzare to have a Scottish war of independence if the feudal lords and kings in the area have no will to fight the English off. Besides, the English rarely conquer much of Scotland.
Well no, Nationalism wasn't a defined idea or word back then. Nationalism itself was in its infancy; people were not fighting for the country itself, but the people that live within its borders. Frankly this sort of response is to be expected, given the fact that Edward chose to allow the Lords in Scotland the rights of Primae Noctis.
These sort of revolutions are already somewhat portrayed, I think the event goes something like "The peasants have taken up arms against your oppressive rule" And a one or two thousand man army spawns in the province of question. These rebellions are very easily crushed, sometimes just by raising the levies in the actual province, not to mention the complete lifelessness of the rebels, they just sit there waiting for the inhabitants of the castle to surrender. Once they've conquered the County they don't even move on, just sack and loot the holdings which is, in my knowledge, quite counter-intuitive.
To get to the point, there needs to be a proper revolt against the English when/if they control part/all of Scotland, mainly backed by the peasants. Possibly the Noble pushing for the restoration of Scotland could have the option to betray the peasants and give in to English rule, or continue fighting and restore its independence.
