It is unfortunate that Ficus Hillii hybrids are being pushed by landscapers. The root system of all ornamental figs is bad. The Flash variety is just a smaller version of Ficus microcarpa which is a massive tree. They ALL have roots that cause severe structural damage to homes, pools, driveways, walls etc. As a very experienced garden designer, I have seen too many instances of considerable structural problems caused by this plant family. Beware.

As a professional window tinter here in Tasmania , I've often solved many of these types of situations with an application of a decorative opaque / frosted film to the glass balustrades with an added suggestion of using light weight plant holders hooked onto the stainless top rail ;if safe to do so ; to increase the overall privacy height as well as doing same to the end/ side walls . I believe doing it this way will allow you a wider choice of smaller & cheaper plants to choose from rather than having to use up valuable floor space with larger pots and equally taller and more expensive plants which may also limit the choices suitable for the location . Photo included here is one showing only a portion of each panel of glass done starting from the lower edge of the glass going up part way by approx 600 mm. which still allows the scenic views over the neighbours roof lines. As you have have a situation with high buildings overlooking you as well ,does make the situation harder to offer the best alround and cost effective way to solve your particular situation ,but I hope this may be of use . As much as I like decorative mesh screens as a suggestion , I believe the deco film option can be the cheapest option whilst providing extra glass protection by shatter proofing the glass . Gary ,Protek window tinting & blinds (Tasmania )

Bunnings sell some very attractive & durable screens that you can install with a strong metal channel frame - quite straightforward to do yourself, and will attach to Colourbond with pop rivets & by extending the frame all the way to the ground to be safe... if you like them, ask a builder for advise just in case they blow into the neighbours shed & smash their windows! Orientating them horizontal rather than vertical, and running across the top of the fence perhaps. There's heaps of designs - here's one https://www.bunnings.com.au/matrix-1800-x-900-x-7mm-charcoal-orbit-decor-screen-panel_p3041106

I think given that your deck faces south-southwest, and there is a privacy screen on the western side, i think skylights would bring in more light to the area and thus inside your house. If are worried at all, you can get skylights that you can pull a shade across when you want to. I have a northerly facing deck and a 5m tall gabled tiled roof over the 7m deck. I have put a skylight on the eastern and western sides of the roof and am very happy with the amount of light it brings into the house, particularly in winter.