Which plaintext languages to try?

[ReneZ]

The whole discussion about doubled consonants is relevant for simple ciphers of the type that barely change the text beyond some basic forms of substitution. These are already known not to work.
It is not just doubled consontants that are the issue. The entire statistical distribution of all character pairs is completely changed in the Voynich text.

At the same time, it is factually incorrect that there are no simple ciphers that can remove or hide doubled consonants. Transposition ciphers can do this very well. The more complex diplomatic ciphers that are contemporary with the Voynich MS include many that specifically substitute doubled characters to remove or hide them.