Force buying related products when the user buy another

[yumanji]

I have been searching for more than a week a possible solution to this problem on the forums, but I have not found any solution.
In my store I sell DIY product, which consists of several separate elements. Each element is a different product. A structure, auxiliary elements, an electrical current, etc ..
The problem is that when the user purchases a specific structure I have to force the user to purchase a minimum of 3 auxiliaries. If the user purchases a different structure I have to force him to buy 5 auxiliary elements. (Each structure requires a minimum number of elements)

I tried using packs of products, but the system forces me to decide exactly which items to include in the pack (the system does not say 'The user, in the pack, choose any of the three products in this category'). I tested packs with product with attributes, but this functionality does not work because the system doesn't allow to select the attributes of each product of the pack.

Does anyone know any possible solution to this problem?