QGis aligning to grid north

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My first post here.I'm designing a map at 500.000 for Italy and with EPSG 3035 or 3034 (Lambert Conical Conformal) I'm still deciding... anyway...In my map I've several points whose symbol is a sort of "rose of winds" and I need they will remain aligned with the Grid North.How could I do that? I think I'd have to calculate the angle between the Grid North and True North so I could put its value in a column that Qgis can read as an angle of rotation.

I tried with the formula



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