Hi old sport! By rummaging through the files of your Mod Menu with DnSpy, I tried to add the ability to edit all characters with your ready-made code and somehow I managed. Unfortunately I couldn't add Mrs Pomp because I just couldn't find her in the game files. It took me over 5 hours to figure out how to do it, but without your ready-made code, I probably wouldn't have done it. I greet and wish you further success.
Of course, to be clear, I don't want to compete with you that way or anything like that. I just wanted to show that your code works very well for other characters as well.