Good question. I had not noticed that on their website. (Until your post I was still unaware of it.)
The way this came about is that I had a problem when a spider got caught under my lens cap and made itself a web on the lens. (!) I emailed WO for advice on how to properly clean the lens. In amongst their suggested answer (distilled water, but in the end it was isopropyl alcohol that did the trick), they spontaneously offered me this new "apo-upgrade" lens for $399. Naturally it took me less than a millisecond to accept.
Only after I'd ordered it did I notice on their website that they also had a package that included the microfocuser. (Still didn't notice the USA only bit.) I emailed them again and they unhesitatingly agreed to send me that too, for the cost of the gap.
So I don't really know what the story is for regular Aussie amateurs. They
did say that they were doing this because they wanted to promote the lens (I didn't even know that this was a regular offer for anyone at that stage.) Why they thought I would be in a position to promote it I've got no idea, but it seemed only right, fair and just for me to post details here on IIS. (Do you think I should have declared a conflict of interest?
)
Anyway, my suggestion to you is email William Yang. Tell him you've had this funnel web get itself under your lens cap...