I made a curses-only HC necro in 1.09, who eventually died to Hell Ancients, so I´d say reaching 1.10 Hell shouldn´t be too much of a problem in SC...
He didn´t use Confuse/Attract or Life Tap. Instead, he had a rogue mercenary doing all the killing. Dim Vision was the main skill for crowd control, with Terror as an alternative. Amplify Damage, Lower Resist (against PIs) and Decrepify were used to speed up the killing when less crowd control was needed. Decrepify was also used to keep speedy melee bosses at bay.
I used skills from other trees (provided by items) a total of 5 times:
* Bone Prison against NM and Hell Duriel (+ Iron Maiden). The necromancer himself was the IM target for Duriel in Normal. Pretty cool, huh?
* Raise Skeletal Mage against NM Nihlathak, to clean up corpses from the ground. I never tried to fight him in Hell. Was going to if I had made Guardian.
* Fire Golem against Hell Diablo.
* Bone Prison against Hell Ancients. Backfired (I ran out of space), and he got killed.
In 1.10, the melee mercenaries are a lot better and can easier get better weapons, so it´s probably easier to have one of those. Any of the 7 types will do, really. Give him a big hurty weapon and use Life Tap liberally and other curses to give him fewer enemies to tackle at a time.
But a rogue would be more stylish...
I have a very detailed (over 40 pages, a real beast) story of the whole event. I can mail it to you if you want.