Hi there, I am in a similar situation too. I imported a European 2008 Rx400h form UK to New Zeeland and have been advised that Nav player for Australia/NZ is Denso based and the NZ maps don't work on an European based Aisin Nav player.
Just wanted to check whether anyone who is heading to Europe with their RX400 or similar with Denso based Nav is interested in swapping with a Aisin Nav player with E10 original dvd maps (4) which worked in Erope few month ago.
Regards
Sam