How to memorize a selected property, duplicate its layer and move the selection onto the duplicata?

Hello, I'm actually trying to have a script performing the action I described in the title.

I spent a day or two trying it in many ways possible but with no success. The best I could do was to duplicate the layer and move the selection onto the first property which is "Mask". Unfortunately, that's not the one I originally selected plus it's a group of properties...

Any tips ?