I said "move to owner's discard pile" as a way to circumvent locked cards without complicated phrasing, because my post is long enough already. This would also use the interaction where locked cards that are moved somewhere other than the play pile remain locked.
If the ribbons were worth 2 instead of 3, then to create a blackjack with 3 ribbons each one could gain 5 value and then reset later. (In addition to being the value of the cards, 5 is also the value of the Akatan / Aotan combo.) I was actually thinking the different types of ribbons could have different functions. Poetry Ribbon could be another all-suits-at-once card, while Blue Ribbon could be spades or nothings and have an additional blackjack effect.