Yes, downriggers of course.
The closure on the Kenai and Kasilof shouldn't effect the other fishing much if at all.
Nobody uses bait for red salmon or trout on those rivers anyway.
It might effect silvers a little bit. But, they will also readily hit spoons, plugs, and spinners so not really a big deal there either.
Though I do miss the river being full of king salmon. They are a blast to catch in fresh or saltwater.