Now, that is a model ripped off Kingdom Hearts. As I understand it, ripping models from other games and importing them into FF7 is substantially more difficult then just messing with what's already in the game with Kimera.
What you could do is replace the save point with "Mog" (the moogle that appears in the Choco/Mog summon). He's in the magic.lgp - he shouldn't be difficult to find.
The difficulty here is that save points only have one "bone" (I believe), whereas things like Mog have several. This makes things rather cumbersome to work with in Kimera - you'll see what I mean when you try it. Also, Mog, as he is in the magic.lgp, is inappropriately sized for the field, and you will need to resize each part of him individually.