It's not WGT problem or responsibility. It's the player's responsibility to make sure the equipment bag is stocked properly according to the rules of the competition in any game. Put enough of your preferred ball in stock before you enter a competition. WGT even gives you the opportunity to get more of your preferred ball while you're playing before you run out!
In a real life competition using these rules (which are allowed to be imposed by a tournament committee) you would be disqualified. You would lose and not even finish the round. At least WGT gives you something to finish with.
Solve your problem by getting two, three or four sleeves of your preferred ball. Every time you "open" the last sleeve (get down to 3 or less balls) buy some more. Problem solved, You don't run out or get upset about the starter balls and no one has to program anything.