Theory: perhaps the letters do not have phonemic content?

[ololololo]

I never said it doesn't either, so I have nothing to prove.

No problems.

If Voynich Manuscript vellum was dated to 1850, most people would have said "well, someone had a very strange hobby" and moved on.

It is unlikely that they would say that nowadays, provided that the VMS would look exactly the same.
In general, if you try and write a text that: 1). Unusual 2). Incomparable to anything 3). Interesting for analysis, then at least people will be interested in the text. 
By the way, you can just try to distort some old language beyond recognition, and then it would become a sensation, they say, "look! The language of this manuscript is similar to Old French!".