It's a pleasure to learn a word such as univocalic.
But I have to say, given its definition, wouldn't the word be even more fun if it included an E (and perhaps, sometimes, a Y) to go with its A, I, O and U? Can I unilaterally declare "univocalickey" to be a new word?
If you're feeling univocalickey, please note that AWAD is running a univocalic contest (click the definition page, linked above, and then scroll about halfway down). Pick your favorite vowel and have at it!