Hi Outback,
you must be annoyed that your van is delayed, but to be fair, holidaying over summer isn't that enjoyable in Aus, i prefer the other 3 seasons, hopefully you see it before autumn.
We decided not to head off and tour Aus again this year, as it was too hot to go north to NT when NT decided that we could enter and WA hadn't opened their borders.
We couldn't really go south from QLD at the time, and a lot of stuff that we wanted to do was closed even in QLD, so we will head off come March, hopefully we will be able to travel without too many restrictions, fingers crossed.
This time last year we were over in WA in the van, but looking forward to getting back over there to explore some more.
As for bike storage, you can get a towbar bike swing away mount, but that'll gets annoying to disconnect when you want to open the tailgate.
I used a Fiamma bike mount and modified it for my storage box, not cheap, but well built and hasn't fallen off from our last trip around aus, as for the soft bag, it's an unknown, you never know what lowlife is out there, you will also need upgraded tailgate struts, most likey 1250nm if you have 2 bikes.
i keep my recovery gear in the cupboard under the bed, as there is a bit of weight with the snatch straps, shackles tire plugs eta
I'm not sure if your camper has roof rails, but a removable rack could be the answer when you are travelling and then you can remove it so you can park your van.
Nothing is cheap when it comes to these campers