A wrench attack runs on one assumption: that one person, under enough pressure, can move everything.
Multisig takes that apart.
No single signer can send the funds, so no single person can be forced to. A time-locked key cannot sign yet, so there is nothing in it to take today.
None of this makes you less of a target, but it removes the single point they can break.
On July 29, we walk through building custody with no single point of coercion.
Gart Webinar: Multisig wallets and timelocks,
Held by the Sound Money Solutions team, led by @npub1klkk...x3vt Hillebrand.
July 29, 2:00 PM UTC. Limited seats.
Register: 
Gart
Gart Webinar: Multi-signature Wallets & Timelocks
Digital Security Series, Session 5. An Introduction to Gart's Remote Training.
We also built it so you're not stuck approving every signature at exactly the wrong moment. Gart uses a small separate identity for in-app actions, signing them in the background, so your real key stays put in Amber and nothing slows you down.
Give it a try and let me know if Amber connects well for you.