The video with DK64 sound clips you posted earlier has all the ones I had suggested to use for Star KOs, specifically the higher pitched screams between 0:10 and 0:12. When K. Rool is launched out of K. Lumsy's cavern, you can hear the former use all 3 high pitched screams one after the other.
And it may just be me, but all the other voice clips in that same video you posted (DK64 K.Rool) don't sound as deep as when they're heard in-game. If you can make them just a tiny bit deeper, they'd be perfect to use for your mod (along with the K. Rool clips from other games after lowering their pitch). Or you can use them as they are, and they'll still sound pretty good.
Is it possible to make K. Rool's running animation identical to his DKC 1 animation?
If K.Rool gets the SNES alternate costumes, the Crown throw can be easily replaced with the Kaptain's Pirate hat and Baron K.Roolenstein's toupée being thrown. The Boxing costume is the most problematic one though.
For those who are not aware, Baron K.Roolenstein not only wears a toupée, but also an upper fake cranium. Thus, his scientist costume's ''Crown throw'' would be throwing the headlight and everything above it.