J15 VM2.02 same product with two lang. and two diff. refs cannot be managed.

[estruct]

Here is a thing that is clearly not possible to have in VM2!!!

I want to promote and sell a product that have the exact same content - let's say a book - in english and spanish.
These two products are strictly the same unless the reference  and the language content 
SP-001 for spanish book and EN-001 for english book.

I would like my spanish buyers to see the spanish book and my english buyers to the see the english one.
In virtuemart 2.02 and joomla 1.5 is not possible to do that using joomfish.

First intent - switch the SKU with language:  the product SKU is not saved in VM backend interface per language i.e. it is unic for both languages.
So this way cannot be used

Second intent: Creates two separate products but in this case is not possible to switch them with joomfish...
Got a trick ? Please share ...