Just add a generic "pull the handle" animation, both with or without the slot machine there, (like how the laptop emote spawns said laptop out of nowhere), then add generic "woohoo I won" and "darnit I lost" emotes, and you're set. Fallout 76 added a slot machine a while back, then a bunch more in their Atlantic City update, and they pretty much go unused for all the effort they put into them...