Choice of glyphs

[-JKP-]

fach9s 9ka4 ar ataiin Sh54 Sh5r9 cThres 9k5s Sh5489
s5r9 cKhar 5r 9 kaer chtaiin Shar are cThar cThar 8an
s9aiir Shek9 5r 9kaiin Sh58 cTh5ar9 cThes 8araiin s9
85iin 5tee9 5te5s r545t9 cTh*ar 8aiin 5taiin 5r 5kan 

That's the first lines of Voynichese where I replaced glyphs which may have looked like numbers to the medieval eye with modern numbers. The idea is not some kind of substitution, but rather to imitate the visual effect. I went for the dramatic option by choosing JKP's 5 instead of 0 for EVA-0.

You could take that a step farther and substitute 2 for EVA-s (2 was sometimes written like EVA-s):

fach92 9ka4 ar ataiin Sh54 Sh5r9 cThre2 9k52 Sh5489
25r9 cKhar 5r 9 kaer chtaiin Shar are cThar cThar 8an
29aiir Shek9 5r 9kaiin Sh58 cTh5ar9 cThe2 8araiin 29
85iin 5tee9 5te52 r545t9 cTh*ar 8aiin 5taiin 5r 5kan

Or, you could go another direction and treat those that look like Roman numerals as though they are.

Of course, even if this is the right idea, it's not guaranteed that numbers match their shapes. If it were a numeric system, the shape for 4 might represent 8, for example.