I'd like to suggest that a consumable Trophy Lock be available for studios to purchase with Diamonds that would serve as insurance against trophy loss 1 time per purchase. It might be nice if it could be purchased before winning a trophy, in the event that a trophy is one in a studio challenge - to prevent from immediately losing it in a defensive fight.
The number of Trophy Locks could be limited to the number in effect/purchased at any given time, so a studio could pick which trophy or trophies they want to protect from loss. If multiple locks are made available - maybe the cost could scale with the number of locks owned/in effect so it gets more expensive to protect more trophies. If no trophy already in possession is protected, but a studio has purchased a 'Trophy Lock' it would be auto-applied to the next trophy won in a studio fight.
If a studio loses a fight which would normally result in the studio losing a 'protected' trophy, the trophy lock would be consumed instead, and the trophy ownership would be retained. The studio would need to re-purchase and re-apply another Trophy Lock before the next at-risk event if they want the loss protection to be in effect once again.