From some of the reveal streams, it looks like the dread-naught might cater to your needs.

Didn't they also say that The Taken would show up anywhere? Not just the Dreadnaught?

I think it will ultimately depend on the drop rates.

Maybe they will match Cipher drop rates? I've only done Skolas twice and got Ciphers both times. I know the Cipher isn't a guaranteed drop, but I feel like it does have a high drop rate on Skolas. Maybe it'll work like that for the weapons, now. Higher the PoE level, higher chance for drop?

Doesn't it just mean that like other new bounties, when you complete it, you don't need to manually return to the vendor?

https://www.reddit.com/r/DestinyTheGame/comments/3jjt0c/bungie_weekly_update_09032015/cupttbr

Pretty much confirmed here, if you have an incomplete Thorn for instance, you just get Thorn without all the hassle of PVP :)

I haven't gears of danielout before but the people of Reddit seemed to accept that, so I will as well. Finally beat Skolas on Tuesday and got my first elder cipher, was very concerned I wouldn't have time to finish it, now I'm a little less anxious and can focus on grimoire.

2. "The Elder Cipher will no longer drop upon completion of the Skolas Challenge Arena in the Prison of Elders. The Exotic items offered with the Elder Cipher will now have a chance to drop from the Prison of Elders Treasure Chest."

Soooo...no more Exotic quest for these either? Just play and RNG drops?

I feel like this is them attempting to maintain a level of rarity to these weapons. The Cipher was a relatively common drop from Skolas, who is likely becoming much easier to beat once everyone can match/exceed his level.

Of course, I'm probably going to be wrong because I have no idea what the drop rate will be for these weapons.