I know exactly what you're trying to do but I'm wondering if the answer to your question may be manufacturer-specific. When one occ switch is on and the other is off then the "off" one is getting 120 volts fed into its output. On a regular switch - no problem. But with these you have electronics involved which may or may not be damaged - either right away or over time.
Why not avoid the chance of this happening and install two Lutron wireless Maestro controls and as many wireless occ sensors to cover the area (wall or ceiling mount). You'll get better coverage because you can mount the sensors anywhere instead of having to rely on the existing locations of the switches.[Link: lutron.com]