Lingua Volgare Shorthand

[ginocaspari]

D(P/F)IE (P/F)OTMO OL OLC(P/F)UE (P/F)AR S(P/F)ARARE

E CVE (P/F)AR OR O(P/F)E T(P/F)O LDOTE ODOTN (P/F)OTE

TA? D(P/F)E D(P/F)OD(P/F)E (PI/FI)E TD(PI/FI)VE C(P/F)E DOC(P/F)OTE TAL

TAL (P/F)ODUO TM TARE IO (P/F)UE (P/F)ODOTE

This looks more like proto-Romance than any form of Italian.
The three short examples of "grammar" discussed actually do not conform to the grammar of a Romance language, e.g. the determinative article "o" is invariant like "the", rather than inflected by gender and number.

The system also features Gibbs-like flexibility. E.g. the first word of the first sample kShody can be made to match a number of Italian words and expressions. Some examples:

DP/FOTE

de piote "out from its clod of soil"

deposte - demoted
disposte - arranged
disponete - you arrange
dio puote - god can
dio potea - god could
dio pote - god prunes
da ponte - from [the] bridge
da fonte - from [the] source
di porte - of doors
do forte - I give strongly
dà forte - s/he gives strongly
di potere - of power
di fiorite - of flowered
deiforme te - godlike you
deformate - deformed
deportate - deported

Dear Marco,
thank you very much for your input. While a shorthand naturally increases flexibility, it is by far not as arbitrary as you show here. We read the bench glyph with plume as Pi/Fi. This excludes the following of your suggestions:

deposte, disposte, disponete, dio puote, dio potea, dio pote, da ponte, da fonte, di porte, do forte, da forte, di potere, deiforme te, deformate, and deportate. The only one that might be considered is "di fiorite" but since we have identified the word fior / fiore, it would much more likely be abbreviated as D(I/E)FIOR(I)TE than the rather awkward abbreviation D(i)FIO(ri)TE that does not capture the root FIOR.

Also note that while extreme contractions can occur and are well-known in medieval manuscripts (like a single T for T(erminus)) these have to be very frequent words that are commonly used. What also often happens is that we find a word in its full form at the beginning of a text that is then later on abbreviated. We believe to have such a case for the frequent word fol which occurs at the beginning of the manuscript as folie. 

While it might seem to be possible to just randomly add letters in between the glyphs, that is absolutely not what a shorthand solution looks like.