Why and how the text could be Bavarian

[ReneZ]

This is absolutely correct. 
Of course there are many possible ways to do this, and doing this causes Voynich words to become considerably shorter, so at best parts of words or syllables.

A recent attempt I made along these lines resulted in character and bigram entropies that are smack in the middle of Latin, Italian and German (but alas, and needless to say, did not result in meaningful text).