I agree, Geoff. Most of the time when I write Scots I use standard English spellings, unless I'm highlighting a particular singer's pronunciation. There are problems, of course, when the English spelling is how the words would be pronounced in Scots, eg night, laugh, plough.

To return to the original point, I've been singing 'Bourgeois Blues' for half a century despite the fact that I'm only black (or dubh) in Scotland.