Well, trinity beam paladin requires
Wizardspike
Wizardspike
Dagger (Sacred)
One-Hand Damage: 37
Required Level: 100
Required Dexterity: 376
Item Level: 120
Dexterity Damage Bonus: (0.11 per Dexterity)%
-70% to Enemy Elemental Resistances
50% Cast Speed
+(4 to 8) to Trinity Beam
+2 to Life (Based on Character Level)
Maximum Mana +20%
Regenerate Mana +30%
Socketed (2)
, an ilvl 120 unique, which means you can't get it before farming Duncraig. So if you can get it, sure this build will be awesome and manage all ubers from what I've seen. However it seems that you do need lots of expensive gear.
As for 2-hand zon, I doubt it. As the guy before me said, it's a meme, a joke. I wouldn't bet on it.
That being said, there are almost no builds that can do every uber reliably. You often will have to respec, especially in the later ubers.