Wouldn't a fresh install of WIndows 10 on a removable SSD which I only put in the computer to access wallets be secure enough? I could keep copies of all seeds in safety deposit box at bank.
Any other ideas? How about my old android/apple phone I am not using? I could do a fresh install on it and only use it for wallet then power it off when not using.
I think those are safe enough as long as you keep them offline and you use it for crypto only and no other things. I use a dedicated unit for my wallet and keep them offline. I only put it online to make transactions or updates, otherwise it is safely kept inside my room.