I like that idea

Is everyone else Ok with how the current Tenebrium skill works then?
I admit, for marksmanship or marksmanship/scoundrel this skill is great, why choose between bows, crossbows or 1 handed when you can just choose Tenebrium.
And for man-at-arms chars this is great too, you no longer need to choose between 1-handed or 2-handed. You can have both.
Just don't waste any points in the original weapon proficiencies and you don't even need to respec