Let's make sure we are on the same page here. Ph A and Ph B are what you call L1 & L2 and you connect either red or black to Ph C to swap direction? The other stays unconnected? That sounds strange to me for a 3p motor but if that is how it works, you need a single pole double throw switch. Connect the Ph3 to the common and red and black to the other 2. That is just direction control, you still need a disconnect.
