i think they have done like the folks down at Douglas Bar. where you pay a yearly fee and with that you get a key to unlock the gate to access the river.
if you have a boat, i think the Douglas Bar site is a much better deal (my opinion). but you do need like a sled or outboard on your drift boat to get upstream.
with 2 bit you can launch at Sultan and still fish that run. though you do have to put up with boat traffic at Sultan.