The function to switch models is: lol i tricked you
You'll need to wait for the player selector to be released, then it may still not even be released. Only the Biblio Techa modding team and very trusted modders have access to it. The reason is, we beleive people will make tons of mods for simply switching to 1-ped. EX: There is a example script for spawning and recruiting one ped. People made many copies of it and simply changed who spawns, and that isn't very interesting/hard. So if the code for switching models gets released, then there'd be tons of seperate mods JUST for one model. There are other reasons too.