I'm not so sure; given their ultimately unhappy experience of the two-term Lib-Lab coalition in the Scottish parliament, I suspect they'd shy away from full coalition.

But they might be persuaded to be loose allies of a minority government - much as they, and the Greens, are in the current SNP minority-administration in the Scottish parliament. Which is working surprisingly well. Of course, it's bulwarked by a fixed-term that is sadly lacking in Westminster.