When using https://iancoleman.io/bip39/ with the seed words from your hardware wallet, taking your computer offline is not enough! Get a Linux LIVE DVD, boot from it, don't give it internet access, close the curtains, copy IanColeman's site on a USB stick, don't give it access to any hard drives, run from RAM only, and play around with it until you have the private keys you need. Then turn off the PC and wipe it's memory.