In the series underrated #3dprinting models is this printable styrofoam screw:

https://www.printables.com/model/826091-parametric-styrofoam-eps-xps-foam-screw-anchor

It comes with a parametric freecad model so you can make the right pair of screw that can accept whatever weirdly dimensioned metallic screw comes with what need to go on the wall.

edit: To clarify: the model is not mine, but I find it to be one of the most useful things that came out of my printer :)