Yes I like to use the 2-minor chord in Fraulein, and any other passing chords when I play alone. Who cares how the "original" recorded version was? Do it the way YOU like. However if you are playing with others, they may like to know about your version ahead of time.
The first recorded hit of a tune is often not the "original" version as written anyway. If it's a well known song, it has also probably been covered in various keys and arrangements as well.
So just play the way that works best for you! == Johnny in Oklahoma City