unmask a handful of cards regardless of Face up/down

I have a handful of cards, some can be in face up state and some in face down. Each card basically implemented a “Mask” trait.
Is there a simple way to send out one key command and unmask all the masked cards? (i…e right now when I indiscriminately send out a control-F, every card just flips so you still end up with a hand of some face up and some down. Thanks.

A piece in a masked state has the property ObscuredToOthers=true. Using this, you could have a GKC send the Mask keystroke to only face-down cards by using this in the property match expression.

Awesome, thanks!