Stick to your real voice. Far too many people in Britain and Ireland in general seem to think that 'contemporary' songs have to be sung in a fake mid-atlantic accent; it seems to be especially common in Scotland, though. I know a lot who do it without even realising, and I think that's a pity.

Scottish accents are no harder to understand than English ones; it's just that a lot of people compare the stronger Scottish regional accents with 'standard' English, which isn't comparing like with like. Barnsley can equal Aberdeen in impenetrability any day, for example. Your accent is really only quite light anyway; you could afford to lay it on thicker if that felt right to you. I suppose that the occasional word might possibly need a gloss in sleevenotes, but only the ones that aren't used outside Scotland any more.

I don't usually pay much heed to singer-songwriters (there are so many) but I do like the way you structure your tunes. A good Scottish style, in fact, and positively enhanced by a natural Scottish accent.