Investigations into all the stories of right hand drive C5's proved them to be just that - just stories. I spoke personally to Dave Hill, John Cafarro and Dave McLellan in 2002 about RHD Corvettes and while they admitted the C5 should allow a better conversion, that was a coincidence and a RHD C5 was never planned. The sheer numbers required, they claimed, made it not worthwhile to build. Unless GM could be assured of substantially increased sales by supplying a RHD model I doubt it will happen. Just because GM build a couple of experimental RHD models for each generation it doesn't result in production of them unfortunately. I reckon if a RHD Corvette does happen it will probably be via HSV who would take a complete or mostly complete vehicle and essentially convert it. (They'd probably be pretty pricey too.) A certain Queensland company probably wouldn't like the competition but then, if it happened, it might result in cheaper C6's, maybe, perhaps...
It would help if the UK insisted on new cars being RHD for their roads, as this would offer another market, but as a member of the EEC I doubt that would happen.
By the way in NSW, to get US style (shape) number plates made, according to the RTA, requires orders of about 10,000 a year to be economically viable.
The only other 'legal' way to obtain a plate that fits a US number plate mount is to find a car with NSW 1988 Bicentiennial plates that is still registered, buy it and tranfer the plates - or marry the owner or prove a defacto relationship or get them to adopt you or you them. Sort of complicates things unecessarily doesn't it?