You do understand that the VFD control handles forward/reverse switching, right? There is absolutely no reason to add a switch for that purpose. In fact, the sudden high current event that occurs if you happen to want to switch directions by using a drum type switch can and probably would ruin the VFD. They are dependent on information derived from the back EMF that you would definitely interfere with by putting any sort of switch between the motor and the VFD.
Everyone here has indicated that you shouldn't put anything between them, and yet you seem determined to do so. May I ask why? What is it that you hope to gain? Perhaps if we understood, we could offer some safer alternative.