Let there be meaning

[ReneZ]

Well, what you are describing here is a cipher that is very close to a simple-substitution cipher. Only one out of every several characters deviates from it. This is a way how groups can be preserved, i.e. not broken up. 

But all of that isn't too relevant for the Voynich MS text.

To go from a Latin text to Voynichese, the bigram entropy has to be descreased.
The way to do that is NOT by adding more variation (varying ciphers). It is by reducing variation. We also need to create the word patterns in the cipher text, but introducing patterns helps to reduce entropy, so that is good news.

It does not help with the quasi-repetitions and all the stuf Patrick Feaster has presented, and I am not yet aware of any good way to achieve these two things.