Also I think I can actually do both ideas you have. We could be focused in one area, but its also possible to be called to far off cities to help catch these at large conduits, on occasion.
I'm thinking for an age limit 16 at the youngest.
I may choose to forbid certain powers that the group considers op.
I'll allow people to create the occasional minor antagonist/conduit on the run.
With the DUP present we can either do before the fall of Augustine or after. I do think after would work, following the Delsin's evil storyline so she's dead and he is at large with Fetch and Eugene.
The DUP has been given more funding than ever under its new command of "currently unnamed conduit" also because the actions of delsin feeding into the fear of the general public.
Its possible we could run into them or they may pop up later. But as for now it would minimal appearances, generally news casts, DUP officers talking about Seattle and etc.