Unless your first name happens to be Sheikh then transferring the AWD from a Scout to a vRS would be astronomically expensive as you would need pretty much a whole car to swap bits from.
What you can do though is buy a 1.8TSi Scout, add a K04 Turbo from an Audi S3, Golf ED30/Pirelli/R, Seat Leon Cupra and a few other bits like a 3" downpipe etc.
Roberts your mother's brother and hey presto you have an AWD Scout with circa 320bhp and 350lb/ft
I've seen this done and although it was good fun the power was still a litlle much for the Haldex. You can get uprated haldex controllers though.
I've seen one 4WD conversion on a MK2 Octavia. I think the guy was from russia and it cost about £10K GBP so whatever that works out at Aus$
On my last car i had Anti lift kit, FSD Suspension and use GY Eagle F1 Assymmetric 2 tyres and that gave better grip in the wet. Just needed to learn to feed the power in and i could get a fairly quick launch in the wet and use a lot of the power wheneever i wanted.
'07 Touareg V6 TDI with air suspension
'98 Mk3 Cabriolet 2.0 8V
'99 A4 Quattro 1.8T
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