At the moment, DarkPhysX is still being worked upon to be compatable with DGDK, and DGDK.NET. There is a .NET wrapper for the Ageia drivers which can be located here:
http://www.zelsnack.com/jason/JttZ/Novodex_NET_Wrapper/
The essential tools thread has the DGDK.NET version of the ODE physics plugin I converted from the original DBP version, but I'm not aware of a plugin version to run alongside the DGDK (C++) version. The DBP plugin can be converted quite easily to use DGDK, this needs to be downloaded from the U6 Extras, and I can't recall the link to it.
Here's the thread for DGDK.NET tools:
http://forum.thegamecreators.com/?m=forum_view&t=100531&b=22
Anyway, choice is yours.