But you'll need 2048 words and associations between them. It's going to take a significantly long time for you to figure out words to associate with each of those numbers. Also, if someone can figure out a few common guesses on what word you'd assign a number (the Michael Jordan bulls jersey really stands out in this regard) then you lose one of the main advantages of this PEG system - that people don't know your words, as BIP39 wordlists are public for everyone to see.