I stand to be corrected on the sensor query, but I seem to recall reading someone fitting aftermarket wheels and having an issue with the sensors, hence why I flagged it up. Hopefully someone with direct experience will be along shortly to clarify further.
I love the look of the Borbets as well, in fact I was considering a Gen2 GS430 Sport before I went for my Gen3, the staggered Borbets suit the Gen2 well.
Hope the trip to Lexus proves fruitful, will await your news.