Lou,
Sadly it may be some time before it's relevant but I expect that your Struie membership comes with affiliation to the SGU, so I think you qualify for the "Scottish" rate (as I do as a member of two Scottish clubs), whilst my Scottish wife, living in England but born in Fife, doesn't!
I know that Dumbarnie has been offering limited numbers of tee times to local clubs at a significantly discounted rate, presumably with the hope of encouraging locals to play (or join). I doubt there'll be many paying the full non-Scottish rack rate this year.