Hello everyone, I would like to suggest that the KeepKey hard wallet be added to the ADA currency so that I can store it more securely
You are in a wrong forum. You should take this suggestion to KeepKey or ShapeShift forums. Cardano has no control over what crypto private companies add to their Hardware Wallets.
However, if their customers keep demanding it on KeepKey forums/ blogs/ twitter, then they might see it as profitable to add requested crypto.