Art The Clown Moveset Idea
M1: Knife (What you start out with): So this kind of works as your normal M1.
M2: So trash bags spawn around the map, and when he goes up to one, a menu pops up (Kind of like The Lich) and there's 3 different weapons to choose from that all do something different. So the items are:
Hacksaw: If you are able to hit the survivor with the hacksaw, it will injure you, but it also gives an effect called Rusted, there you kind of get slower over time and it can down you way way later.
Pistol: This works a little bit like deathslinger, so you can aim with this weapon and shoot someone, but you only have one shot, before the cooldown runs out. The gun does down them, but you may have to switch weapons right after.
Comments
You say there is three weapons in the bag but you listed only two.
Still the Hacksaw needs better definition as what can survivors do to prevent going down like it sounds to me quite strong weapon if the killer just needs to hit you once to get you go down eventually without them being able to do anything about it. Also there is already a mechanic for this in the game and thats Deep Wound.