Bip39 Entropy To Mnemonic Default range of iterations Employed in wallets is 2048. Increasing this number should really make it safer in opposition to brute drive attacks, however you'll have to store this price. To obtain your wallet with custom PBKDF2 you need to use this script (or equivalent) to https://peakbookmarks.com/story18710086/bip39-mnemonic-checker-the-best-side-of-seed-phrase-generator