Yeah, not worth the while.
Also yes, this would extend to characters like Yoshi, Belle & Fox being able to swap between their official voices & real raptor/shih-tzu/fox noises respectively, just for shigerus 'n' giggles.
Just something I want to point out. It's one thing to give DK, Diddy and Bowser animalistic roars, and its another different thing to give Yoshi and Fox animalistic roars. Its not a valid comparison.
Fox and his crew are characters that are anthropomorphized to resemble animals in a human frame. They are also human in lifestyle with very few or no animal tendencies whatsoever, that live in a civilization that resembles ours.
With the Yoshis, we have a different case. They were designed to look and sound adorable which is why their cries resemble baby talk, as they are cutesy caricatures of dinosaurs. Which is why raptor sounds (and by that I assume the ones we see in Jurassic Park) aren't a good fit for them.
In contrast, DK and his crew are animals with human-like intelligence depending on the game, but they move and act like animals. There have even been points during their gaming history where they have sounded like the animals they are supposed to be. This also applies to Bowser. The only time DK and co. have been given the same kind of personification the Star Fox Team has was in the DK Country cartoon, where they stood straight and walked like humans and were more like people who happened to look like apes.
Overall, DK isn't as human as Fox is and he isn't as cutesy as a Yoshi, which is why he doesn't face the same problems they would have if you swapped out their voices. DK can easily pull off gorilla grunts without conflicting with his character like they would. It annoys me to no end that people keep bringing this up as if it is a good comparison, saying "DK sounding like a gorilla is like if they gave Fox a fox's bark and Yoshi a raptor's roar". It's a dumb fallacy that shows how little they understand those characters.