Everyone has different experiences of the Independence debate: I too am not originally Scottish (got teased at primary school for having a "foreign" surname, but think that would have happened wherever in the UK I was) but have never felt unwelcome - even when I came back to Scotland after 10 years working in England with an "English" accent (even though in England - which was the only place I had ever experienced nasty teasing bordering on racism - I was still considered to have a Scottish accent).
I have one friend (actually met her via MN) who moved up here specifically to vote in the Referendum and after a month she and her also English dh decided this was their "forever home" and feel very at home.
Ironically, the SNP got a lot of flack for making the voting eligibility in the Indyref all those that lived in Scotland, regardless of race or nationality - and not including the Scottish diaspora who had left the country - so not allowing some "pure"
Scots a vote.
I didn't support the SNP in the 80s or 90s only moved back to Scotland in 94 anyway (am one of those Labour supporters that has lost faith with the party), but my impression is that as Labour moved right under Blair, SNP moved Left. This creates a chain reaction as more Left Wing people join or support the SNP.
But I do agree that the SNP is a broad church with pragmatic policies. I fully expect it to split if/when Scotland achieves its independence. I truly hope that then Scottish Labour can re-discover its soul and principles as the government of an independent Scotland doesn't need to be an SNP one, but I fear that it may be too far gone 
But anyway, this is at the moment a side show to the Westminsterenders Hunger Games 