Why people feel that it would be hard to give the Warden a voice is beyond me.
Think back. Is it that long that anyone has created a Warden in Origins, already??
You could choose from voice samples there, too. Just get some actors that go with these and make them the sample voices for the Warden again.
Bioware has done great things in their long life of making these sort of games.
So I think it is not impossible to put in an option on what sort of characteristic (diplomatic, lawful, quirky, humorous, forceful, etc.) the Warden had for players to choose from and record some voice samples with actors that fit the bill of the old voice samples we had in Origins.
The idea with the DLC is really awesome. I would love to have the Warden take more action in this one, because it goes against a Darkspawn Magister after all. One that controls mages and Grey Wardens alike. How could he/she ignore that??
Same goes for all the memorable characters we had so far. Most of them are just notes and letters from the War Table, which in my opinion is pretty lazy for some of them. We never hear of Shale, Wynne or Oghren again and even Zevran is not heard of again if you choose to have him romance the Warden.
Sten gets to be Arishok, but we never actually get to see him in that role. All we hear of him is a conversation between Bull and Varric.
Bioware, please. Don't let the potential of all these memorable characters go to waste. You didn't do so in Mass Effect, why let it happen in DA Inquisition?
If it is about money/the budget, just put up a patrion page or a kickstarter project for your fans to help you making a DLC of such proportions. We would gladly do so if it could bring back the glory of all DA titles to help with a War that literally is placed upon the very world these people tried to protect.
:3