That's because the spell animations are not used for item activation. It's been awhile but I'm fairly certain that you won't find the animation in spells.2da since it isn't technically a spell so the ones in there are ignored for this. In fact, all the activate item spells have no animation set up in there anyway (the xVisual columns are all set to **** which means none). It's generated automatically and every time by the engine internally I believe, and you cannot disable it using 2das IIRC. One of those NWNX add-ons probably has a way to do it I imagine.
Ok, for some reason I thought I remembered it being pretty finicky to do it without NWNX.
As far as I know, though, the bypass function doesn't exist in the windows version of NWNX_Events. I've only ever seen/used it in the LInux version.
Does anyone know if it's been ported?