We just launched AirGap Knox: AirGap Knox is the final piece of the puzzle for AirGap Vault
This looks interesting, and I would consider testing how this works with another older smartphone device I have, but than I saw this should be paid $35.90 and I am not sure if source code can be verified.
Can AirGap Knox be installed on any Android devices, included devices with custom ROM's or Pixel phones that operate with GrapheneOS (not that I would do that), or stock Android must be used?
Correct me if I am wrong but I think we can achieve something similar to disable everything on software level, and for little more money we can already buy brand new hardware wallets.