Rx300 Rx330, Rx400 Steering Wheel Remote Working With Aftermarket Ster

[alitech]

I am looking to upgrade the stock Lexus radio, CD, Cassette player with an aftermarket double din player. Looking at JVC, Pioneer and Kenwood right now with built in sat nav, bluetooth etc. I want the head units to work with the lexus steering wheel controls but have difficulty finding a device or patch through that will make this possible. Has anyone had this done recently? Any advice?

BTW, I have an 2005 RX400h. The one that does not have a Sat nav, reverse camera or bluetooth option, hence the reason for going for an aftermarket all in one soution. I am going to buy this facia to get the double din fitted.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=360246911625&ssPageName=STRK:MEWAX:IT

Thanks.