You decide that you should use a loophole. Since there are no rules, aside from "No wishes can interfere with each other." given to you. So if they say you can't do this, it's the magic & the person who sold you this to blame for not explaining ALL the rules!
So, you wish: "I wish I could break any rules this magic stone has or will have regardless of previous rules, negotations, or situations, agreements etc."
You feel & the magic release itself from the stone, signalling to you that your wish worked.
Now to be rid of the other problem...