Is there any character like that?

[cvetkakocj@rogers.com]

One simple encoding option is that "po" could possibly be the ligature qo.

You are right, EVA qo is actually po, which was a most common prefix, which was also used to form a perfective verbs. Besides that, it can also be part of the word, or preposition po, if written separately. Because the Voynich words are short, po still very seldom occurs in the middle of the word, except when they are prefixed. This is one distinguishing similarity with Slavic language.