What hardware signing devices permit adding manual entropy other than coldcard?
You could just create your own seed words from soup to nuts - which pretty much all signing devices accept.
BitBox has a nifty lookup table for manually generating each word offline from 11 bits of dice roll entropy.
*this is not an endorsement of BitBox itself (I've never used it), but this method is device agnostic - save for the final word (with embedded checksum) which can get a bit tricky... but some devices are designed to help you more easily land on a valid final word.
https://bitbox.swiss/bitbox02/BitBox_Diceware_LookupTable.pdf
BitBox has a nifty lookup table for manually generating each word offline from 11 bits of dice roll entropy.
*this is not an endorsement of BitBox itself (I've never used it), but this method is device agnostic - save for the final word (with embedded checksum) which can get a bit tricky... but some devices are designed to help you more easily land on a valid final word.
https://bitbox.swiss/bitbox02/BitBox_Diceware_LookupTable.pdf
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