Just add 5% onto your paypal charge -- have a nice day.
If you really think that in a b2b situation people will pay Bitcoin -- offer it with no surcharge and see what happens. If you are in a niche market where people have Bitcoin or some other digital currency maybe it will work (doubtful)
product = 100
PayPal surcharge = 5
Total =105
World commerce should be facilitated through the World Bank or other NGO entity offered for that purpose. But it's not. Protectionist trade, blame Trump, whatever ...
Just do business in Australia -- problem solved
