MR cancel weapon effect + Penetration item

[Numahr]

I have read something about it somewhere, but I wanted to check my assumption was correct. So can anyone confirm that if

1. the wielder of a weapon with an effect canceled by MR (Star of Thraldom, ethereal crossbow, stone sword, etc.)

2. also wears magic penetration item (Eye of the Void etc.)

-> then the Penetration item applies to the weapon's effect?

As a side discussion, you may tell interesting experiences/ideas of such combinations. For example I am thinking of a couple of Caelum's simple A1 mages (for Aim) with etheral crossbows and Eyes of the Void, scripted on Fire at Large Monsters, as anti-SCs artillery in a balanced army, or anti-thug in combination with PD...

Thanks in advance