I would rethink your plan.
A PIR used for automation purposes, while it can be standard PIR, the location for effective use generally precludes a security application's location.
For wired, standard security, I would go with Bosch's Blueline Gen 2's or DS 835I's (somewhat harder to get now).
leave the tab/mask alone for pet immunity. It masks out the immediate lookdown which is disabled for pet immunity. Even if you're not using it now, unless the coverage pattern simply won't cover the area, leave the detector set for pet immune.
Just askjng: why would you want to?