Setting product options with product id

Hello,

I would like to ask you for an advice how to solve this problem:

I have an accounting software in which every product variant is created as individual product. For example, if I have one shirt in 5 colors and 5 sizes, it is 25 individual products in my accounting software.
I would like to have variants set as product options in my eshop. So instead of having 25 products in one category, the user could choose color and size from html select buttons when viewing the product.

The problem is, all the plugins that can connect my accounting software with opencart doesn't support product options, because those doesn't have their own product id and plugins aren't able to pair product varaints in eshop with products in accounting software.

How would you solve this? Is there any plugin that adds product id to variants? Or do you have any other idea?

Thanks in advance for every idea on how to solve this .

usually people would modify product options to include SKU

is it may be can be done as shown here: https://www.furniturestorenyc.com/bedro ... 1390lp.htm , this site using volusion and instead of child products can be used colors you interesting?