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Downgrade option

Allow players to downgrade champions to lower ranks and return catalysts, gold, and iso to allow players to upgrade more desired champions.
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And before you or anyone else says it, yes, one RDT is not game breaking, which is why we on very rare occasions see one. But when you give one, someone asks why not two, then three, then why not just make them available. RDTs are a drug players too easily get addicted to. It is just not worth it to release them in any small quantities just to fight the fight over where the line should be drawn.
Your suggestion falls into the category of wars long fought and won (or lost, depending on which side you're own).