Origin of the Shield Shape in the Solar Folio of the f85-86 Foldout

[ReneZ]

I already demonstrated with some certainty that the three red embellishments in You are not allowed to view links. Register or Login to view. are Beneventan glyphs

You found examples of similar glyphs. That is not an identification.

Note that Beneventan is not more than a particular style of writing that was in use in some limited areas in Europe in a limited period of time.

This time predates the writing of the Voynich MS by a large margin.

It is a name for a script. It is not a potential provenance.