Atoms and elements of the Voynichese alphabet

[Stefan Wirtz_2]

My current best guess for the Voynichese alphabet --[..], fancy variants (p, f), non-phonetic or "foreign-sound" symbols (q, v, x), mere handwriting variants or deformations (b, g, j, u), and what I suspect are tone or pitch codes (a, o, y) [..] 4 + 4 + 6 + 4 + 4 = 22 distinct phonemes.

And that count does not include { a o y } or considers the possibility that these glyphs too may be letter modifiers, in addition to e.  
[..]

Strange ideas.
You are degrading carefully written Voynichese characters to some "fancies" (p,f) of the same letter, abbreviations, deformations, and dump the working-horses of this alphabet into some "modifier" bin.
With the same right, one could shoot t and k into the very corner of "being just of identical meaning, some writers did not like the curls much". But why?

For all those assumptions there is no solid proof and nearly no observation underlying -- the gifs you attached here just show what is possible with a quill or pencil in general: yes, somebody can make some mistakes, but A still isn't V then...

There may be a deviation or significant difference between z and m = one can easily be a sloppy or style variant of the other, or as well be a completely different character, that cannot be defined by the material so far.

But there is no point or reason to blame non-proven "quillos" at a heavy rate for being "meant" as something completely different...