This part isn't happening without the *.fla files, which we don't have. All we have are the compiled *.swf files, which can't really be edited.
While we could create a new UI element to overwrite a current one it would be difficult getting any sort of interaction working without knowing the names of the functions to call in the action script.
You can unpack the *.swf files with JPEXS [0] which gives you either the required ActionScript and *.fla files (Export to FLA), or you can unpack everything (Export all parts) which includes fonts, vector graphics etc.
[0]
https://www.free-decompiler.com/flash/features/
