Voynich Bombe - thanks for that link. I happened to mention this codex recently, but had no idea where it was. Very good to know. Thank you.
More generally, I think 'enigmas' are more reflective of the perceiver's ignorance than any quality inherent in the object. Generally. Take the pyramids' method of construction. It was an 'enigma' only until people learned enough to understand how it was done.
With most things, and with the Voynich manuscript too, the enigma will be solved when we start to be more critical of our own assumptions. All bad arguments and bad theories stem from faulty premises.
As for what is comparable to the Voynich imagery - I've spent a bit of time on that, but the main problem is that when people begin with a theory, they become so attached to it that it becomes difficult even to "see" contrary evidence.
I'm fairly sure that I've found a text which is closely comparable to the way in which folio 75v has been constructed, but frankly I don't think it's worth talking about except with outside experts just yet. I cannot think of anyone in Voynich studies who'd not boggle at the thought of a text as comparable which has such a provenance. Sorry if that sounds enigmatic.