For what its worth Snoopy, Westpac initial provisioning was 2.5% of market cap so on an adjusted basis that suggests ~ $17m for HGH.
As you suggest they have very different business models but I would suggest whatever level of specific and general provisioning banks bring to account in their books is nothing better than a very wild guess anyway as everyone is effectively just throwing darts at a dartboard while blindfolded as we're in unchartered waters and nobody has a playbook for this thing or how its going to affect their customers.
Concentrate of the level of their capital adequacy and liquidity, those are the more reliable indicators we have, right at the moment.