I don't get it. Counting your points at the end of the game is straightforward. The only issues that some might experience are with calculating points for the Palace Guards, and I don't see how a score pad would be all that useful just for that.
Indeed. There's not that many points to be scored per player anyway, and it's all just pluses and a few minuses. There's no end bonuses, hidden scores or multipliers at all.
We usually put all nobles of the same value together in one row in front of us so there's no confusion even with the palace guards (3 of them - they go to row 3).
Pre-apply any +1 'colour bonuses' while doing this, and it's perfectly clear how many points you have all the time.