Some of the kinetic gems that changes the Loadout animation are quite nice as taunts such as the Allure of the Succubus(QoP kinetic gem) or the Obeisance of the Keeper(KotL kinetic gem). It is currently only available for view in the player loadout screen. To make it as a taunt may be difficult as the current taunts require an item in the 'Taunt' slot of each hero. I suggest the kinetic gem not only provides a custom loadout animation but also as an idle animation and victory animation in-game. Hope my suggestion is taken into consideration. Cheers!