There is no way to reverse bimbofication yet, sadly. Sorry about that. If you really want to remove it from one of your saves, you just need to change the variables in your save file.
- They're located in C:\Users[YourUsername]\AppData\LocalLow\Niem2D\Femboy Survival
- open your save folder, then change "bimbo": true, "bimboExp": X, to "bimbo": false, "bimboExp": 0.
Hope this helps for now! I'll add ways to remove the effect later on. And about the wiki, unfortunately, neither the game nor outsiders have a wiki. I'll keep this in mind in the hopes that I might be able to achieve it eventually.