Whizbang Dustyboots
Gnometown Hero
Have you actually tried it? Because skills for NPCs don't matter unless you're doing some sort of strange "and now Acerak and I will engage in competitive magical research" thing. Not knowing what item creation feats Eclavdra has will not affect play at the table at all -- and if you get into a situation where you decide some 1E NPC's feats do matter, just give them those feats.Sure, you could use AD&D stuff in 3E... as long as you didn't mind calculating Fort/Ref/Will saves from scratch, adjusting hit points and damage to a radically different scale, figuring up touch and flat-footed AC, making up ability scores for monsters, assigning skill points and feats, figuring iterative attacks, converting multiclass characters, and a billion other details.
Converting saving throws just means choosing which ones map to which different versions in 3E (the conversion booklet actually does that for you as I recall) and the rest of it doesn't matter other than armor class.
In actual practice, it's dead easy and can (and is) done on the fly.