I don't think Granite are going to be part of any plans, since they don't seem to have actually been able to buy Regional. I would be stunned if Regional wasn't simply part of the deal with IAG now.
The Scottish Government can't really get involved in funding themselves, though they have various entities that might be able to help. However, the idea that Alex Salmond would put his money where is mouth is over this, is I'm afraid unlikely.