6WCL disabling Dimmer

Hi is there a way where I can disable the Caseta Dimmer 6WCL and use it like a PD-5WS? I want to use it for my bathroom that has a exhaust fan and light combo.
I can't seem to be able to find the PD-5WS switch at any major store. All they have are the 6ANS and they all require a neutral wire... The PD-5WS cost 75$ that really expensive for a simple switch so I'm looking for alternative but does not want to move away from Lutron family. Can someone assist? Or have a solution?

This cannot be done in an in-wall device. you will need to switch to the PD-5WS or the PD-6ANS to accomplish this. Or save the money and go with the MS-OPS2 stand alone occ/vac sensor. That thing is bomb-proof.