A key to understand the VMS

[-JKP-]

And interestingly enough, these glyphs that resemble vowels in the Roman alphabet also seem to behave as vowels, in that they occur in every word and delimit groups of 1-2 consonants.  To me that suggests an obvious explanation: they are vowels.

And what other plausible explanation is there, really?  Some unknown and undemonstrated cipher mechanism that magically produces ciphertext with any and all properties we might desire?

Have you looked at how many "o" glyphs there are and how they are positioned? Do you truly believe these are all vowels?