Importing node reference using referenced node cck fields

Hi
This is my first post here. I'll try to explain the issue in the simplest way

I have two types of content:
-Product, with CCK fields Product_number, Manufacturer, Family, Version. With http://drupal.org/project/unique_field, I made sure that the combination (Title,Product_number,Manufacturer,Family,Version) was unique.

-Logitics, with fields date, souce, destination, and Product (node reference to the product type)
For data entry, I am using http://drupal.org/project/nodereference_explorer widget. It allows the user to search for the right product, in a popup frame, using exposed filters.

But now I need to load into my base is a huge list of logistics entries:
date, souce, destination, Product number, Manufacturer, Family, Version (the fields of the product content)

How do I ask node_import to identify the right Product Node ? It seems able to lookup the node's title (although it is not narrowing the search to the referenced nodes types, as explained in http://drupal.org/node/514552)

In http://drupal.org/node/502396 there is an alternative solution using table wizard + migrate but it looks like a workaround for some old version of node import.
Is there a better solution than this ?

Regards