Which plaintext languages to try?

[Mauro]

Your own example shows double consonants after a few lines already. (Other example of singing italians: quite worthless here)



Doubled consonants can be be found at any corner of venetian, 

so it is just not true to say that there is no „geminizing“ at all in North italian variants. 

At least there are much more than Voynichese can deliver, and maybe less than in today‘s italian.

And this is, again, not the status of some kind of written Venetian 600 years ago.

And yet again, you are wrong. Venetian does not have geminated consonants, at all. When you see the doubled-s in a word such as 'preghesse' they do not represent two geminated [s], indeed... they represent a single [s]: 'preghesse' is pronounced [pre.'ge.se].

*Some* orthographies of Venetian (but not all) use this convention only because an Italian speaker would read 'preghese' as [pre.ge.ze], which would not be understood by a Venetian. With the doubled -s an Italian will read [pre.ge.sse], which is bad Venetian but at least is understandable. A mothertongue Venetian, instead, would wonder why 'preghesse' is written with two -s, when it obviously has only one.

As another example, this is from page 24 of the Eastern Lombard dictionary 'Vocabolario bresciano-italiano di Giovan Battista Melchiori', published in 1817 (You are not allowed to view links. Register or Login to view., when Eastern Lombard was yet a living language:

"Non si ammette alcuna doppia consonante, come inutile, tranne in alcune poche parole, nelle quali sembra che la pronuncia necessariamente il rieccheggia, come in emmatìs, emmuzonàs, emmulàs"

"No double consonants are allowed, because they serve no purpose, except in a few words where it seems the pronunciation necessarily echoes them, as in emmatìs, emmuzonàs, emmulàs".

Melchiori got it right, except for the exceptions... (but notice how he was cautious: 'seems to necessarily echo...') which actually are enmatìs (to go mad) enmüzonàs (to sulk) enmülàs (to become stubborn); notice 'en' means 'in' and is a common prefix for verbs.