Potential Card Rental Security Layer Solution

Got an idea here that could add a layer of security to renting.
Concern - Unlocked Rental Cards
Solution - System that would allow us to hand over our cards to a super secure splinterlands custodian and let the custodian rent them out at our decided values for us. The system could keep possession of the card until the listing is removed and then send it back with a delay timer decided by the card owner. All proceeds would be paid at snapshot in the airdrops. Thoughts? Thanks for entertaining my idea. I posted this in Splinterlands Discord rentals-feedbacksl-story-ideas if you would like to vote up or down.