Hi Jammo
I hate to burst your bubble but the short answer is you should forget about it.
As I'm sure you've covered during your lessons

large obstacles such as high hills surrounding a lake (i.e. Lake Argyle) create heavy turbulence, so any wind you do get around there will be very inconsistent and unlikely to be even kiteable.
Having consistent moderate to strong side-on shore winds and nice beaches to setup is a luxury not many WA city locals really understand until they start traveling in-land or overseas.
Last year I flew back home in Canada and been dreaming about kiting lakes around where I grew up. Without having a ton of experience, a hydrofoil board and boat support, this wouldn't have been possible. No way I would've pulled that off in my first years of kiting, some of the most challenging and unpredictable winds I've ever kited in.
So yeah, I'm not saying it can't be done, it's just not very realistic for your level of experience and that location (Lake Argyle).
Better get a mountain board and play around in some fields if you're that keen :)
Christian