Ok, so I came up with a game once where they could do routine parts to earn points, and then they could spend those points to be able to work upgrade skills.
So like a particular skill or sequence from their routine might have a particular point value, but only if they can show it to me with less than .2 in deductions. Then once they have a certain number of points, they spend them to get, say, 5 attempts at their favorite upgrade skill.
They loved it, worked great. Probably would have worked better if I had physical tokens to use as points, might try that some time.