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I am very sorry to hear that you didn't find enough help in australia to solve your problem.
Normally all the citroen garage have the same software to help us to find the right parts and other things like some update GPS.
But perhaps it is more complicated in some country, the data are mainly provided by navtech, so it could be problem from us.
Here (france) for navidrive GPS it possible to find one update featured with the POI like speed cameras.....
But I agree with your dealer, it isn't possible to download the update due to several reason, firstly it is a big update so it could take a long time to obtain it by internet
And secondly, Citroen advise to install the files in a garage, because you have to erase the HHD in order to put the new update. It is not very complicated, but I broke down one system , and after ii is very hard to find a solution ( how pay what....)
For your bluetooth problem I didn't really understand.
Did you installe a second bluetooth system, or it is the RT5 navidrive how don't work.
Currently the RT5 is bluetooth, but we sometime we have some problem to paired the phoned.
I hope you will find a solution in your country, if you need more information you can contact me.