It seems geography was not a factor. Jordan vs Australia, about the longest trip possible.
Australia will play their home match in Perth, to compensate
. I wouldn't expect there to be any regional limitations (there was East Timor v Mongolia in the last round), doing so for an Asia-wide qualification would be, well, limiting
. I can't believe in this day and age that the AFC Champions League has essentially reverted to an American-style 'East and West' play-off series through to the final.