Question How to convert an entity into a projectile

I am using the code
@EventHandler
public void onShoot(ProjectileLaunchEvent event) {
if (event.getEntity() instanceof Arrow) {
Arrow arrow = (Arrow) event.getEntity();
if (arrow.getShooter() instanceof Player) {
Player shooter = (Player) arrow.getShooter();

event.setCancelled(true);
shooter.launchProjectile(Fireball.class).setVelocity(arrow.getVelocity());
}
}
}

I want launch an Ocelot out of the bow instead of a normal projectile. I tried making an Ocelot class to implement Ocelot, but it was an interface. Is there a way to create a class that extends projectile and somehow is able to have the properties of an Ocelot.

*edit*
It seems what I am asking for is something not done very often. I will also take any ideas on how you think you would be able to replace projectiles when the bow is shot.

 

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