I’ve been exploring Watto’s lines and I’m really not sure. What we have is limited and trying to get the tone right by constructing lines would be a challenge. You really need to maintain him being kind of sneaky (with the implication that his dice are loaded to give him the result he wants). So it’s more than just finding the words.

Yet I really want to make this work…

Edit: but wait. We may not just be limited to the movies! I just found this collection of Watto lines from the pod race video game that may help. Haven’t explored it all yet but I heard him say “no” in the first few seconds…