idk if that would work in real life. there are cases where one sibling gets less than another and judges still rule things have to be split equitably and children should be provided for.
I guess it depends on the country and how much the will deviates from reasonable clauses?
I’m looking into making one now, and a notarised will has to have reasonable clauses straight away; an enclosed will that is open later can say whatever you want, but might be contested if it’s unreasonable.