All you know that cs_set_user_plant/defuse natives controls the corresponding abilities.
But i guess not many noticed that player model isn't updated (backpack/thighpack on the player's back).
For the info: it's controlled by the body pev (1: on/0: off).
You could add an additional native parameter like done for the VIP's model or maybe even hardcode it to the native, it's for you to decide. I personally do not see why we can't harcode it but again, it's up to you.