Replacing Models with Models

[GDelscribe]

Since I am using the Okuu PSA and Vertex over diddy, I found it awkward that she constantly fires peanuts off during the final smash.
I was wondering how I could go about changing the peanut model into something more Utsuho oriented, like a ball of flame.

If its simple replacement I can do it myself, but If it takes some more than that I really am interested in knowing.