Old Czech (Bohemian) or Moravian

[ololololo]

"Voynichese" symbols are made quick-and-easy, whatever the rest of this idea was.

If you invented the alphabet yourself and didn’t explain how to read it, this book will be of no use to another person. No matter how innovative and fast this alphabet may be.

According to this logic, they would have abandoned the Glagolitic script very quickly due to its complex symbols. They would probably have abandoned the Latin script as well...