An Essay on Entropy: what is it, and why is it so important?

[Bernd]

I think the entropy of text rich in roman numerals would be extremely interesting. Surely there must be more books and letters dealing with accounting and financial transactions.

Another idea - have you tried to use coding languages like C, Java, Python for comparison?
Computer code has many voynichese-like properties like "words" and glyph combinations specific to line and paragraph position, repetitions and many similar expressions with slight differences.