Bip39 Mnemonic To Seed Default amount of iterations used in wallets is 2048. Increasing this range must help it become safer towards brute pressure attacks, however you will have to keep this benefit. To obtain your wallet with tailor made PBKDF2 you need to use this script (or equivalent) to https://bookmarksoflife.com/story4095643/random-seed-in-r-not-known-facts-about-bip39-phrase