How can I fill my rich model from repository when I am no using ORM?

I am trying to develop my application using the DDD approach and I should set all of my properties private. I need to use Aerospike as my database and there is no ORM to fill my properties magically like EntityFramework with a private default constructor. Now, How can I fill this reach model without exposing a full property constructor that can be accessible everywhere and can breach the rule of encapsulation business domain rules?

making all properties protected and creating an internal inherited class inside the repository namespace that can act as a proxy object to fill property can be a solution But I have no idea about the best practice and acceptable design.