Start with a custom ini path. Then open prefs and select another WinSCP.ini and when it ask you to overwrite or use you instead press cancel. If you press cancel to close prefs it will ask you again and again and again.
I have attached a video to show what i mean.
Hmm, i get a message that the file is empty so i can't attach any video and now i can't remove the file name so i can't post it. I was needed to create a complete new post :(