Safari tanks have announced on their website that they are well on their way to developing a 30 litre tank for the new Africa Twin. Pricing is expected to be around $1100AU.
http://www.safaritanks.com.au/home/news/211-new-safari-tank-for-honda-africa-twin-coming-soon
The new Africa Twin 30 litre long range tank can now be ordered on the Safari website. The price is $1140AU and the tanks will be ready for shipping in late June.
https://www.safaritanks.com.au/home/shop/product/1678-honda-africa-twin