Choice of glyphs

[Mark Knowles]

So I've been thinking for a while... if we can assume that these glyphs were chosen, then what was the rationale behind their inclusion? It's quite a peculiar set.
....

But why construct a glyph set that relies so heavily on numbers and abbreviation symbols?

I would suggest the glyph set is arbitrary. Without wishing to sound like a broken record, an arbitrary set of characters, like we find in the Voynich, is pretty normal in diplomatic ciphers.