For which camera/lens? If you do a lot of this work maybe a reason to switch over to film - the Konica Hexar AF is practically silent shutter. The Olympus RC is also very quiet leaf-shutter. Cheaper and small !
O|||||||O - exactly and for $1000 I'd expect them to go that extra mile to have controlable buttons. However surely they would just need a smart remote control to plug into the camera to an external set of muted buttons on the box itself.