The first sentence of the OP reads:** I am trying to make a universal script to "clear out all the unwanted items",**

The point is: "trying to make a universal script".

For scripts Poser Poser Python has a function called SetDisplayOrigin(). The description of the function (the "doc" string):

Set if the origin of this actor should be visible in the preview.

https://www.posersoftware.com/documentation/12/index.htm#t=Poser_Python_Manual%2FMethods%2FActor_Methods.htm

But this function does not work at least in P11.

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