Unique systems are a really bad idea. Craig Raw has some advice on best practice for cold storage on his website which I think would be good for most people to look at:

For true cold storage on Sparrow, you need to:

Connect to a private Electrum server Use a good, unique password on your wallet Employ at least a 2-of-3 multisig setup Require hardware wallets from different vendors for a quorum Secure the hardware wallets (and backups) in different locations Minimize the time your cold storage wallet is open in Sparrow (mixing to cold storage is one good reason to keep it open however)