In all the unpickable designs so far, various (potential) attacks are enabled by the ability to manipulate parts connected to each pin/disc/etc using tools held

In all the unpickable designs so far, various (potential) attacks are enabled by the ability to manipulate parts connected to each pin/disc/etc using tools held in the hand. So why not make a lock where the mechanism can't be touched at all? For example, one that is unlocked by inserting a key consisting of only a blade and no bow (handle) fully into a slot before operating a mechanism (separate from the lock mechanism) that, in order: 1. covers the slot through which the key was inserted, 2. slides one wall of the slot aside to reveal a bank of pins that then come into contact with the bitting of the key, 3. if the key is a match, enables further operation such as movement of a deadbolt. The mechanism is then reversed to release the key, which is ejected like a floppy disk / SIM card. Since at no point are the pins exposed to air from the outside world, it becomes impossible to actively move them or probe them for information.