Rather than storing entropy, store the mnemonic created with the entropy. Steganography can be helpful when storing the mnemonic. The random mnemonic generator on this site employs a cryptographically safe random amount generator. The built in random generator can usually be trusted much more than your own instinct about randomness. https://bookmarkwuzz.com/story18839375/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator