My thoughts on this:
a. Find official sources. For travel from Australia, use the
Smartraveller website, the
Embassy of Spain (Canberra) or the
Consulate in Melbourne. The Spanish websites will give you contact details, or just ring the general number, explain your situation and ask for information on any entry restrictions from Hong Kong.
b. be cautious about expecting insurers to payout for additional costs for 'just in case' changes. They are likely to require either the Australian or Spanish governments to provide formal advice that travel to Hong Kong has been raised to 'Do Not Travel' or similar, or Spain has formally banned entry from Hong Kong. When I checked a moment ago, the DFAT advice for Hong Kong was 'Exercise a high degree of caution'.
c. Consult your insurer - you do have one, don't you? Check what their tolerance is for these matters, and when they are going to be prepared to compensate you for changes.
d. If you have booked through a travel agent, keep in touch with them. If you have booked directly with the airline, contact them directly or watch their web pages for information about any flight changes and cancellations. If you have provided an email address, they should be in touch with you about these, but given the circumstances, you might want to contact them to check the current status of your flights.
In the meantime, I hope all goes well for you and you get to your Camino start point safely.