Cryptoeconomic "ring signatures"

You can use a coinjoin like method to submit all values of multiple validators in one transaction.

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But then you need to have some type of an online off-chain protocol that creates the coinjoin transaction - correct? So it seems to be consensus problem by itself if you want to do it in a decentralized manner.

I guess you can do coinjoin in a contract, but it will require a lot of steps. So using an online off-chain protocol seems to be the most efficient way.