This damn EVA z

[ololololo]

The symbol z looks like a small version of k and appears very rarely in the manuscript. 

And this is definitely not k, since the scribe of Astrology has no problem writing this gallows.

Why not?
Space is limited in this special field; not really a good chance to write the "full scale" gallows.
We see at some other occasions how exceedingly big these gallows were written when the sribes had enough space (like in a first line of a page, of a paragraph, or else).

The question here is: did the inventors of VMS alphabet / cipher set chose to produce different characters which are just a few millimeters different by height? Or did they prefer clearly different characters?

The second question is: does the tail at the end transport an additional meaning with the last character, apart from being just end-of-word?
In the last case, all three z would be identical, and maybe identical with k also.

In the latter case, it’s unlikely, because if it’s dakakm, then km would be an invalid combination.