Hi,
There is a guy down south in Poole, Dorset (Luke Gormer, Prestige Care Media) who does this. I imported an LS430 previously and had the satnav on that converted by Luke. It's not cheap but it certainly worked very well - just like the UK version, with full touch screen capability). Luke is a very nice, helpful and knowledgeable chap - certainly worth contacting him for the latest infornation.