use two logic_relay entities, lets say “relay_skin0” and “relay_skin1”
relay_skin0 should set the model’s skin to 0, then enable relay_skin1, then disable relay_skin0
relay_skin1 should set the model’s skin to 1, then enable relay_skin0, then disable relay_skin1
if the model starts with skin0, set “relay_skin0” to start disabled, or vice versa.
The button should have two outputs
OnPressed, relay_skin1, Trigger
OnPressed, relay_skin0, Trigger
The button will now toggle between skins, because each logic_relay will enable the other and disable itself when triggered, only one of the relays will be able to be triggered by the button.