I'm not sure this car fits your bill.
Before it gets exported it really needs the engine number and capacity updating on the documents. That my be something the vendor is willing to do for you as a condition of the sale. I don't know how thoroughly your inspectors look at stuff like that, they may not notice a capacity error but an engine number is a little more obvious if they can find it. Is there a local inspection/department that you can talk to?

This car has been known to the Club since it was first built so we can say with certainty that it's more than 15 years old.

If you do decide that this car is for you it is possible to convert it to LHD but it's a compromise as the footwells are wider on the drivers side as built and moving the spine of the car isn't really practical. Everything else can be done on this chassis. Later Hawks are harder to successfully convert to LHD.
As you note, there are very few for sale. Sometimes you just need to buy what's available!