That sounds very close to the meta rule of being only allowed to change the rule to more precise rule. So you have the rule of not eating cookies and come across a very special cookie. Making an exception opens the door to arbitrary exceptions. But what about changing the rule to allow only cookies that you have never eaten before? That is clearly a rule that allows this special cookie and also future special cookies, satisfies the culinary curiosity without noticaby impacting the calories.
That sounds very close to the meta rule of being only allowed to change the rule to more precise rule. So you have the rule of not eating cookies and come across a very special cookie. Making an exception opens the door to arbitrary exceptions. But what about changing the rule to allow only cookies that you have never eaten before? That is clearly a rule that allows this special cookie and also future special cookies, satisfies the culinary curiosity without noticaby impacting the calories.