Sad Sif and joining the Darkwraiths

Hello all

Just wondering, is there a way to access the DLC, have the different introduction to Sif the boss and join the Darkwraith covenant in the same playthrough? I may be missing something but it seems that without the ring from Sif, I can't get to the Four Kings and meet Kaathe, but in order to access the DLC I need to have placed the Lordvessel to remove the yellow fog from the Duke's Archives, but having placed the Lordvessel first Kaathe may not appear? Am I missing anything?

Much appreciated.

If you jump down the hole in Firelink and place the Lordvessel both Kaathe and Frampt will turn on you.

As far as I know there is no way to get the alternate Sif and side with Kaathe.

I'd say probably not, but the scenario you present seems to be created purely for that function. I can't see a reason why you absolutely needed to do both of those things in the same playthrough.