AFAIK the RHD models have a different ECU or there is enough difference in its software that you can't use tunes made for LHD ECUs.
I suggest looking for shops that do supercharger installations on the 3.8 and then find out if any of them do custom tunes.
My own research many years ago showed that the 3.8 doesn't have much performance "locked away" that off-the-shelf tunes can unlock, which probably means you will need a custom tune after creating performance headroom or removing restrictions through things like an exhaust with high-performance cats and a good intake (they will also make the 3.8 sound awesome). That is the start of a very slippery cost slope for very little performance gains on the 3.8 though...
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The average human walks 1,500km per year and drinks 83L of beer which means we're getting 18km/L.
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