maybe something like Golden Skateboard%? Gives the incentive to get a specific amount of money as fast as you can to buy the skateboard

Another Idea would be Arrest%, even tho it would be quite fast, I think I can see a bit of possibility with it

Small silly one would also be trash%, fill your trashcan as fast as you can and sell the trashbag that you get from it inside the burner, timer ends on money collect

I will be updating this comment if something jumps into my mind.