You'd need to watch the temperature, but what about just connecting the upper and lower radiator hoses using a section of pipe, allowing the coolant to circulate as normal? I'd think that you'd want to remove the thermostat and reinstall the housing without it first, so that the engine didn't heat up quite as rapidly, but it would likely still heat up pretty fast. Just a question of whether you could run it long enough. Of course, you could do this, let it get hot, then just turn it off and let it sit for a while, then drain it. Do it a few times, then flush it out well with clean water and reinstall the radiator.
I have used a piece of pipe connected to the lower radiator hose to "back flush" my radiator, disconnected the upper hose, ran water in through the bottem radiator outlet and let it flow backwards up and out of the filler neck.
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