The short answer my guess would be no.
Gov Dept being Gov Dept, they would look at the VIN plate and see it as a 2 seat.
Beyond that I would suggest its a long dark path to go down for "engineering approval" and from things I have looked at in times gone past a requirement was additional seats must face forward.
A life time ago I fitted extra seats into a toyota hiace van in QLD, I was required to have engineered approved plates under the floor, but didnt require seat belt mounts as the seats were from a bus that had the belts integrated in the seats. So the seats themselves had an Australian standards mark on them.
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