It does sound like one hell of a job.
Unfortunate thing is, you can swap the whole underdash, but except for the UK, all of Europe is LHD... so it wont fit.
So I would need to rebuild my LHD underdash with a RHD one... a lot of time and work for a small thing like this.

I got this from HT;
http://www.honda-tech.com/zerothread?id=2183885

Nice info on some things, but too bad it isn't completed yet...
All I need to know is if the parts that need to be swapped from RHD to LHD stuff will fit on the LHD underdash...
If so, it's a pretty cool project to undertake (I wouldn't be surprised to be the first one in the Netherlands with climate control other than an imported JDM EG6 if there are any).