10 seconds with Google shows Allianz appears to cover you, if you are diagnosed with Covid including a medevac back to Australia. Page 28 of their PDS refers, however they won't cover changed travel plans, etc, you must have taken sufficient precautions etc...
Be very careful about this statement in the PDS in regard to travel alerts/warnings;
But please note, other terms, conditions, limits and exclusions continue to apply, including (for example) the exclusions set out in section 2.1.2 below and the General Exclusion concerning Travel alerts and other warnings (see page 64 in the General Exclusions section). That means, you will not be covered if you or your travel companion contracted the epidemic or pandemic sickness when you had travelled against an advice or warning by an Australian government and did not take appropriate action to avoid contracting the sickness (for example by delaying travel to the country or part of the country referred to in the warning).
Current advice for travel to USA (travel ban not withsatanding);
We continue to advise:
Do not travel to the United States of America, including Alaska, Puerto Rico and the Hawaiian Islands due to the health risks from the COVID-19 pandemic and the significant disruptions to global travel.
Germany;
We continue to advise:
Do not travel to Germany due to the health risks from the COVID-19 pandemic and the significant disruptions to global travel.
UK;
We continue to advise:
Do not travel to the United Kingdom due to the health risks from the COVID-19 pandemic and the significant disruptions to global travel.
Again the fine print will catch you. Make sure the travel advice says there are no pandemic health risks (level 1 and level 2 with some caveats). I can't see them dropping the Covid health risks warning for some time in those countries.