Voynich text as Base20

[ReneZ]

The leading zeroes problem occurs when mapping letters to digits, but this can be circumvented by not using 0 to 9 but 1 to T where T stands for 10.
So you get:  6 , 7 , 8 , 9 , T , 11 , 12
and :  98 , 99 , 9T , T1 , T2
and :  T9 , TT , 111
This is of course a rather cumbersome system.

However, you are increasing entropy while converting the plaintext, so this won't work.