I don't think Eric Scitt would've done any other kind of voice, because, you know, his voice is broke, and Klonoa's (in Phantomillian) evidentially isn't... It's like asking Samuel l Jackson to voice a little girl, what do you expect him to sound like?
I usually like to play a game with he voices set to it's original language. Though, If it were up to me, I'd give Klonoa an accent based on Phantomillian, but we know little to nothing about that language, so... =/