I like your solution, but I have few questions about it
Can I sell goods from Germany to Bulgaria with your rented company, If I am not buying these goods by your company?
I mean can I do the buying process/transactions of my business outside of the rented company?
The scheme you proposed contradicts the basic principles of business and accounting, since a company cannot sell what it does not have and what it has never acquired.
The rented company can act as an agent in a sale and purchase transaction and receive an agent commission for its services. Alternatively, the rented company can purchase goods from a supplier and sell them to your customer.