Go to Bunnings and buy the Akorn deflector. It is nice and thick and well made.
https://www.bunnings.com.au/char-griller-smokin-stone_p3180628
You may discover that even at $399 for the Dragon the Akorn is better value at $499 as the Akorn comes with the smoking stone worth $64 and cover which is worth $50-$60. While at Bunnies you can buy the Heat Bead lump charcoal which is better priced than the lump at BBQG. The Akorn has a full catalogue of spares which Bunnies can get it in if you need replacement bits.
The Grill extender on the Akorn is more flexible as you can swing it in and out.