My plan for drinking the Colorado River- suggestions?

Just skip the first step and you'll be good to go.

During dam releases without rain storms (ie fairly clear water) I'd just dip a bottle, use chemicals, and drink, but I have a high tolerance for sediment.

I got back from a Tanner to South Bass trip 1 week ago. The river is now sediment-filled but not too thick. I did not filter or treat and it was fine. My experienced Canyon-hiker friend who joined me for the 1st half of the trip used only Aqua-mira. It depends on your level of comfort with treating/not treating, but you can do both. It didn't take long for the sediment to settle either.

Your scenario is similar to what I used there as well. We were rafting from just below lake Powell to Lake Mead and used a plastic bucket for the the water to settle, but the rest was the same. Fantastic trip!

Jason Klass’ setup is worth considering – http://www.backpackinglight.com/cgi-bin/backpackinglight/aquamira_frontier_pro_filter.html I wonder how long a Frontier Pro would last before the sediment gets to it?

Shave some more weight:
“BackpackingLight.com recommends that your repackage Aqua Mira in our MiniDrop Bottle, which results in a lower-volume kit suitable for up to a week of hiking at a total weight of about an ounce.”

Do a search for flocking agents.

no idea if this is feasible, I've never traveled in a high-sediment water area, but a possibility for, if nothing else, some trail fun:

Take a bottle, platy, other sealable water containing device
Get some cordage, stronger is better, guyline should suffice
Tie it to the neck of the bottle
Fill and cap bottle
Swing the bottle on the string in a 2-3 foot radius horizontally at a decent clip, don't hit yourself or your friends.

Thought being, you're making a centrifuge of sorts to settle the heavy sediments more quickly. No idea if this would work, but worst case, you just look like a fool for a minute and find out that it was a waste of said minute.

I'd love to know if this would work though…

I'm gonna do what I've been doing and maybe bring a little alum. I am going with two GC noobs that I expect to have a low tolerance for the sediment.

I love the centrifuge idea, but it scares me too… : )

I was thinking about this on my hour drive home from work today (sad I know), I think I'm going to give it a go this weekend, just toss a little dirt from the backyard in a water bottle, fill it and shake it up til the sediment suspends, and try the guyline centrifuge to see if it makes any marked difference in 15-20 seconds of doing it.

If that time period worked, it would seem feasible, any longer than that would be just annoying to me. It would seem it would sure beat sitting and waiting in the hot canyon sun.