I'm with you up until you convert the keys for hat and quit back to hex. I don't understand what you mean by applying substitution at that step, or where the strings:
73746179
6c6f76
Are coming from. At the end result, it appears you've re-encrypted the message to decrypt as the desired output after changing those 2 words. But does that help decrypt the original message somehow if you don't know it already?
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