My experience was with a far older car, a 2002 V70 - I installed all the hardware and took it to Volvo for the software installing, they wouldn't/couldn't do this as it wasn't spec'd with the winter pack from new.
Ended up installing aftermarket seat heaters, which was quite time consuming but easy enough, it means I've got 2x holes in a trim panel for the switches, but I made sure they where in an easily replaceable panel (not that it matters now the car in 15 years old).
Suspect as the other poster says, it will be a battle to get them working - I'd advise that you approach Volvo first to see what's possible,
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2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles
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