I've worked out the correct dimensions for relocating the shift knob to suit RHD Torana LH/LX. Details below. I'm probably going to send it to a workshop but If anyone on here is capable and interested in a little extra cash please PM me.
See the attached pictures (White background available on request):
PERSPECTIVE (From driver's seat, perhaps)

TOP

REAR (From behind shifter, looking towards front of vehicle)

SIDE (Driver's view / Right hand side view)

I think the easiest way to manufacture it would be to grab a ~360mm length of 24mm x 7mm bar, carefully make the two bends, drill a hole down the central axis in one end, insert and weld-in a stub of 3/8"-16 threaded rod into that hole to provide a 20mm section, grind back a taper, then drill the mounting holes at the bottom. I'm thinking mild steel that I can then paint black or chrome. Aluminium would be awesome but 6000 series would probably be too expensive or unable to be worked to such a angle.