After just reading on another thread about the difficulty of entered a high entropy private it seems that what is needed is a device that has no connectivity and whose purpose is only to sign transactions.

How about a device with a camera that can scan a destination address then a private 256 QR code key like Armory's, lets you enter an amount and then displays a QR for the signed tx that can then be scanned by an online device?

If you could make this trustworthy it would make secure signing of txs user friendly.

Is anyone working on something like this or is the idea flawed?