Yes, the best approach is to make sure you create the functions with the input/outputs then create the local variables with the exact names and correct types. After that copy and pasting should be for the most part painless.
, I will try and put togethet a list for you tomorrow. There should be the functions in the controller a few events on the event graph and I believe in the Character class too. If that all seems the same as you already migrated then make sure the UI widgets are accessing your class as the PlayerFrame widget has a cast node when reading data, so you will need to replace that to read variables from your own class.
That last part is most likely your issue.
Let me know of that is the case or not.