I also have challenging ukes. Very long, very short, inflexible, stiff, grumpy, semi aggresive... and also the overly verbal one's.
I don't evade them because I think they can help me overcome my own limitations.
I have had a seriously irritating and scary uke one time. A new guy with ADHD (he said) and piercing eyes constantly telling everybody scary stuff about him training special forces in the military and doing very whacky things... (why?) I actualy think he has another mental problem. After a couple of weeks I noticed I didn't feel happy going to aikido practice because of him. And I also learned I wasn't alone. Then, I trained with him one time and he took of again with one of his penetrating speeches... and I had it... Calmly I said I wasn't interrested in his stories, didn't like it and just want to train the techniques. Then I asked him (rather nicely) if we can we do that? still willingly to train with him.
He backed down and seemed rather stressed about my remark. He didn't want to train with me anymore, which was ok with me. That was the last time I trained with him because the next week or so he didn't show up anymore. I don't know the reason why he stopped but I can't imagine that it was because of my remark.
I think giving him assertive feedback on his behaviour was the best thing I could do.