I generally agree, Tom. Some pro-forma quibbles and tweaks:

I know something about fallout. But that' another story.

Hmmmm....reading between the lines explains a lot, I think [;-)]. First I learn you drive a hippie van, now I learn you "know something" about fallout. I'm learning a lot today.

Nothing nuclear will ever satisfy environmentalists,

That's waaay too sweeping a generalization. You're basically lumping suburban families who recycle in with Earth Fist!. Unless NASA really screws the pooch explaining the plan, I don't foresee overwhelming opposition. Like I said to Phil, don't create trouble by anticipating it.

One technique would be to launch the reactor and fuel separately, with the fuel maybe being launched in several subcritical packages.

Yep. Though I expect that multiplying the number of launches will multiply the odds of one failure. I suspect there's an optimum way to split the launches to minimize risk and maximize success.

--Robert