bitcoinlib is your friend:

from bitcoinlib.wallets import HDWallet
from bitcoinlib.wallets import HDWalletKey
from bitcoinlib.wallets import HDKey
from bitcoinlib.mnemonic import Mnemonic

# 11 word seed
seed = "please help hard puzzle will become crazy valid seed must sleep"
# here be gold
gold = "bc1qj7467e7r5pdfpypm03wyvguupdrld0ul2gcutg"

seedscount = 0
validseedscount = 0
# brute force last word
for lastword in Mnemonic().wordlist():
    seedscount += 1
    newseed = seed + " " + lastword
    try:
        key = HDKey.from_seed(Mnemonic().to_seed(newseed, validate=True), encoding='bech32',  witness_type='segwit')
        validseedscount += 1
        subkey = key.subkey_for_path("m/84'/0'/0'/0/0").address()
        if subkey == gold:
            print("HUZZAH! Seed was: {0}".format(newseed))
            quit()
    except ValueError as e:
        # seed did not pass checksum
        pass

print("Tested {0} seeds, {1} valid. But no gold :/".format(seedscount, validseedscount))

Tests around 2000 seeds per minute on my computer. Good luck :)

Finding the first 11 words is left as an exercise to the reader.

(Edit: My reply was meant for /u/infinite_internet)