I was trying to follow your advice, but I saw it myself today! (Either that, or the hallucination is catching. )
Roof open and (from what I can see) looked like the same driver too. It was on the A944 somewhere between Dunecht and Sauchen around 17.30. That isn't far from Westhill so that maybe supports liathach's guess as to where it might spend its days.
I actually had a wee scout round the back of the Westhill shops (because I could ) the other day and found a pink Q5 though not the RF which does tend to support Malcolm’s theory.