Here is the link - Church of Scotland

"The report also proposes that if Scotland becomes independent, monarchs should have a Scottish coronation to symbolise their role as Queen or King of Scots.
"A coronation ceremony would reaffirm the Church’s firm commitment to the monarchy it says and serve as a reminder of the obligations of the monarch to uphold Scottish religious life and traditions and in particular her or his role with regard to the Church of Scotland."

OK. So it was the Church of Scotland that introduced the idea of a Scottish coronation, and not the Prince of Wales.