Thats ^^ what I do more or less, just a couple of dimensional lumber off cuts that are wide enough to do 2 skis at once, tall enough so the bindings don't hit the bench on any ski i own, FR+ needs a lot of clearance
A 2" deep 1/2" slot in one side of the blocks will hold your skis on edge for filing, the ski getting thicker jams into the slot so you don't need to anchor the skis
just a handfull of DW screws to screw it to the bench as far apart as you need