How To Add Paid Characters To Bloons Adventure Time TD?

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Heya, newbie here. I was wondering if there was a way to edit my current save file for Bloons Adventure Time TD? The only thing I want to do is add the paid characters Tuxedo Jake, Dungeon Finn, and Hunter Marceline, along with their respective exclusive weapons, and the Monkey Farmer. I've been searching for ways to achieve this, however there is little to no information on the topic. I'd rather not restart the game with a modded apk and lose all my progress, so would appreciate any help!

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I'm still looking for a viable way to do this, would appreciate any suggestions.