At that point you have got to change over all the private keys in WIF.  I don't know any wallet that allows you to import private key in hex format.  Do not worry though, it is easy.  You just need to write a small program that takes an array of 64 bit numbers (represented in hex) and for each one adds the prefix, compression byte and checksum as described in here:  https://old.learnmeabitcoin.com/technical/wif.  Even ChatGPT could produce it with the first attempt given my reply as an input.