If you are in the vicinity of a Harbor Freight retail store, they have a set of three graduated size pullers the smallest of which "may"
fit. These are designed to pull gears and pulleys off of shafts and assume more clearance than the crank has. By using the smallest one, and perhaps grinding down the end of the bent parts (that actually grab the crank) to thin it up so the arms will fit behing the crank. As the back of the crank is typically curved the arms will slip off unless restrained perhap by a stainless threaded hose clamp. Steve