I know we're having a laugh, but the only people that really think like that are Siol nan Gaidheil and they don't really exist anymore (they haven't for a long time), or certain factions of Orangemen who are pro-Union, along with the entirety of the Scottish far-right. You see, rightism and Fascism in Scotland is traditionally Unionist and pro-British. They'd be talking about the purity of native "Protestant" Scots within the wider Protestant British Kingdom. It's the militant Socialists and Communists who are traditionally pro-independence. That dates right the way back to the forgotten Scottish nationalist insurrections of the early 1800s; our "Radical War" fought by Left-wing thinkers and Liberals who took a decidedly nationalist stance on constitutional matters (i.e. trying to form an independent Scottish Republic a la French Revolution). Even before that when the great bard Robert Burns was writing nationalist poetry in the late 1700s, he was writing with a recognisably leftist slant. Basically, we've had left-wing nationalists in Scotland for a longer period of time than the USA has existed.
During the Second World War our most powerful pro-Nazi politicians included the likes of Sir Archibald Maul-Ramsey, founder of the Nordic League and all-round Nazi, former Unionist Party politician of Angus. Siol nan Gaidheil was basically the only pro-independence Nazi group but they only popped up for a short while back in the '70s and have toned down a hell of a lot in the last 30 years, now they don't really exist at all beyond a few scattered websites. There were Nazi sympathies within some sections of the SNP during the Second World War, but that is in stark contrast to the original founders of the party who included the very first Socialist MP ever in Britain, an all-round hero named Robert Bontine Cunningham-Graham. Those Nazis didn't last long in the party.
But yeah, Donald Findlay is a dead ringer.