Mythic Dreamscape weapons

Now that the crafted legendary lv 66 Elysian weapons are stashable/tradeable, I would like to know

- whether we can start the quest having crafted the Elysian weapons on an alt char before the fix (account)
- if we can start the quest having bought them (inventory)
- any possibility to uncraft weapons crafted pre-fix
- do we still need them in our inventory when we want to turn in the quest after having finished 666 runs?
- detailed info about the mythic dreamscape weapons (stats, procs)?
- are mythic weapons tradeable or account bound

Btw thinking dream shard quest was counting for all the weapons I have crafted, I found it motivating to craft all classes' weapons, and I thought it would be encouraging to cap my other classes and enjoy the mythic weapons, especially after the one char mauso time, but now I think it is not realisitc to do the 666 runs on my other classes since even for one char it's tedious, expensive and quite frustrating due to leechers, people who do not know how to play this raid and afk'ers in this zone.

Yea, would be nice to know.