You sound paranoid. Just use electrums cold storage. Learn to use Linux as all other OS are inherently compromised. Only use Linux for all serious Bitcoin computing work. Maybe set up two or three cold wallets if it helps...to distribute risk and maybe provide a decoy wallet to surrender in the worst case scenario - with SFA in it! Secure seed phrases well. Keep It Simple And relax...understanding freedom comes at a price and with some risk. There is no absolute risk free self custody solution but simplicity and discretion are powerful strategies. Self custody based monetary freedom is only for the brave few who are prepared to carry some risk- otherwise go back to being a fiat debt slavery peon.