Exactly, make sure the only copies of the wallets with your money are on non-networked, non-running hardware, preferably just straight up storage media, and sec

Exactly, make sure the only copies of the wallets with your money are on non-networked, non-running hardware, preferably just straight up storage media, and secure it physically. You can make it as secure as you can possibly make anything. Hell, you could even get it insured.