May 2021 wedding abroad - advice needed!

My fiancé and I are both UK based however getting married in Australia (I’m Aussie, he’s British). We have been engaged almost 2.5 years now, and have had to reschedule twice (originally planned for March 2020, postponed to October 2020, now May 2021).


My family are all in Australia, while my partner’s family are all here, along with friends etc. The plan was for approx. 20-30 people from the UK to travel out to Australia for our wedding.
Obviously we are not alone in the wedding stress department with all that is happening right now, however I am increasingly upset/stressed/losing my mind thinking of rescheduling again. Currently Australia have their borders closed (no one in or out, generally) with no signs as to when they will open. The biggest hint we have is that it won’t be until a vaccine and Australian media are predicting this to be late 2021 at the earliest.
Our wedding is delaying a number of things for us - we had intended on moving back to Australia in the coming year or two but now will have to delay that, along with buying a house, starting a family... and I honestly don’t know if I can go through another postponement.
I’m open to all options here but would love some advise on what other couples would do in this situation. I would be devastated to get married without my mum here (which is the main thing stopping us) and neither of us is overly thrilled by the idea of a registry office wedding here and a bigger wedding later on as we both feel it would take away from the bigger celebration later on...
Any help or advise would be GREATLY appreciated!