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@Velocio
I wouldn't do it.
There isn't a great deal of material in a seat post, you'd be removing almost a third of it to reduce it down.
There's also no guaranteeing that your machining would be up to the task... you might introduce flaws that create weak spots, such that even if the material that remained was enough the structural integrity of the material was compromised.
Just spend longer on eBay waiting for the right part to come up