That is a fascinating idea. Not sure how it works, but great concept indeed. I've been puzzling my mind on doing things to hide but understood by those needed. Are those for sale somewhere?

penlock.io and seedkeys.xyz

Sure was. Thanks for coming and Safe Travels!

It's just out of the factory, and we'll open a Geyser shop in a few weeks. Otherwise, you can go to

Penlock / Level-Up Your Wallet Backup!

Print & assemble Penlock

and find all the guides & components that you can print and assemble the DIY way. Open source and free of charge ;)