Hey Wulfrune,
Implementing this cheat is very complex and time-consuming, as you not only have to access the finances in the game, but you also have to make the entire accounting editable in the game. It would help us a lot if you could send us a savegame which is in a good place to see the Financial Fair Play penalties.
You can find your savegame here: C:\Users[Your Windows Username]\Documents\Sports Interactive[Football Manager title]\games
Then please send it to me as a ZIP file in the ticket system or as a WeTransfer Link.
Thank you in advance!