Yes, check out Steel Windows Australia. They design and hand-build this style of steel window with the thin, elegant frames, and can ship Australia wide. I haven't seen exactly your style of door on their website, but they have every other conceivable shape and size steel frame window (as they are all custom made), so best to contact them. https://www.steelwindowsaustralia.com.au/ The window in your photo is really big, tall and wide, so with traditional window framing materials, like timber and aluminium it is going to be really expensive. When you go to steel windows, it will be even more expensive, plus the cost of shipping to wherever you are - probably on a semi-trailer, with a crane at the other end. So how many tens of thousands of dollars were you hoping to spend on your beautiful, elegant, super-sized, steel framed, custom-made window (including delivery)? Best of luck, Dr Retro Dr Retro House Calls/Dr Retro Virtual Visits

Google “crittall doors”, in Melbourne. https://www.morelandglass.com.au/crittall-steel-windows/

As in our house because the wall at the end of the passage was only a doorway space from the Arch there wasn't any load bearing problem Check with council to see if you can find any old plans, the Archway to the bathroom could be just because you could or that space had a different use a lot of bathrooms and kitchens were at the rear of house the house during that period

Have a look at Steel and Smith in North Adelaide, you can Google them or they have a Facebook page. Beautiful doors.