It’s Monday! Back into Cairn’s salt mines with you. 
How are you supposed to make a different choice with another character then? Would also clash with:
from the Features List
Choice and Consequence gives you power to shape the world and affect the fate of many. Tough decisions will leave significant impact as strangers on the road, families in need and even entire villages may live or perish based on your actions. With great power comes great responsibility and it is not always easy to predict the outcome of your choices in a world driven to desperate extremes.
Faction-Based Questing lets you improve your relations with different NPC groups to earn rewards (such as merchant discounts, new items, and additional quest lines) as your favor with them increases. However, aiding one faction could turn a rival faction into your enemy. Choose which side you will support!
In fact:
They will reset. You will be able to make different choices.[/QUOTE][/INDENT]
So, you will be able to access items from different factions. I only wonder, if they will be level-capped, if you go to a prior difficulty.