Copy a product but force a custom id_product

[Toeareg]

I am using PS 1.5.4

 

Prestashop offers the option to create a copy of a product, but it will assign a new id_product based on the next AUTO_INCREMENT.

I would like to overrule that and use a custom id_product.

 

Can anybody give me a clue where I should tap into the software to force my own custom id_product before the actual copying starts?

 

Thanks for any help.