I would also think that specsavers could be in the mix here. They are a global company and you can see some highlights from their 2017 annual report below, which includes billions of dollars in revenue and a clear mention of a gradual (global) transition into audiology.
https://www.specsavers-spectrum.com/news/specsavers-annual-report-2017/
As far as the aussie stores go i note that they have rolled out 'Audiology' to 29 stores to date and you can view the full store list below, more will continue to be rolled out in time.
https://www.specsavers.com.au/stores/full-store-list
Then looking at their range, should they stock the NUH products, looking at the price points of what they currently offer, it's possible that people that qualify will get them for free via HSP, and others may get a form of rebate through a private health fund.
https://www.specsavers.com.au/hearing/hearing-aids/digital-hearing-range-and-prices
Also a section here on who is eligible for the HSP and how to apply
https://www.specsavers.com.au/hearing/about-hearing/government-hearing-support
Any form of agreement with specsavers i feel would be a company maker on its own. The more i research this company the more mammoth the potential is becoming evident. Of course the flipside is they may never do anything with specsavers as this is speculation, but i feel there has to be a strong probability this may be a chance and it will be with someone.
Plus specsavers are just one company, what other deals must they be working on here? Especially in Nth America once the legislation is sorted for OTC purchase.