Here it is another example of how I keep the keys to a wallet

This procedure is based on steganography.

Totally offline and chip to "control" the access. There's no way that sonebody else could compromise my wallet.
And to manage that wallet (only as watch-only and deposits) I use its xpub key in any other wallet app as I described in another guide

https://darth-coin.github.io/wallets/deposit-only-btc-wallets-en.html