The evolutionary function turns the aliens into what they'd be like after 1000 years of evolution in deadly environment, it's like their final evolutions, so I doubt it'd change anything to enhance that function. We also don't know how it might affect Ben, he said he always felt weird when turning Ultimate, who knows if he won't get hurt with another evolution this time.
The Ultimate forms also aren't registered inside the watch, it's just that it applies the function on the alien currently used. If Ben used that function on an alien he never tried it on, he'd just get an Ultimate form out of it (like Ultimate Rath and Ultimate Gravattack who we never saw until Albedo used them).
I also REALLY doubt Azmuth would do that, he said it himself that the evolutionary function was "asking for trouble". Maybe Albedo, but good luck letting him finding what he needs to do so without trying to kill anybody or commit a crime