The only thing i enter my private key into is a ledger/trezor. When I sign something, the private key never leaves those devices.
What Trezor device do you have? Trezor T natively supports
Shamir Backup. It generates up to 16 shares with 20 or 33 words each. You can also set the number of shares needed to recover your wallet (the minimum is 2).
Currently I only have a ledgers, but I have been thinking of buying trezor too. Thanks, i will check it out.