Bushwalk Australia

I’m looking at getting myself something like the Ee Convert or the FF Flicker but the first is out of stock at Backpacking Light in Melbourne and the second is just not available anywhere here.

Is there an Australian alternative these options? I’ve looked at Nevegear and Tier Gear but neither seem to offer a “full length Zip” or anything such custom option.

Sure there is but not at the UL end of the scale.
The S2S Traveller series.
Despite it not being exactly cheap I am using mine a heck of a lot.
I use it as a summer bag/quilt and as a booster in White season when I use the half bag and down jacket; I do think they are seriously underfilled tho, when I had mine topped up I should have got 200 grams and not the paltry 100 I did. The baffles in my Tr2 are 70mm tall