I tried putting the konahrik mask on this dragon priest's inventory but when i spawn him in the game, he has no mask on, just that...that ugly undead face.

I also tried duplicating a normal dragon priest mask and changing its model to konahrik and it still won't work. Is this mask unwearable by dragon priest or something? and sadly no mods does this in both skyrimnexus and steam. If anyone knows how i can make him wear it or has done it before, please let me know. thanks in advance.

I dont think the dragon priest creatures are able to wear items other then staves.

Damn now that i think about it, your right the other dragon priests has no face, their masks were already in the model. It seems there is no way to put the mask on without making a fresh custom face model. Thanks for the help anyway.

Why don't you just copy Konahrik and modify him?

There is no Konahrik priest, so I assume this is what he's aiming to do.