Topic based permission based on the topics creation_datetime and the users unlock_th

Alice is allowed to see/reply topics which are at least 1 day old and topics that she created herself.
She has an externally set parameter unlock_th = 1 day.

A topic view permission would be based upon
( now - topic_creation_datetime) > unlock_th or creator=user

Does a plugin exist to accomplish this? Can a custom plugin be created?

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Sending a PM regarding this.