I really don't have a complete answer, but please do consider this point.
A will, no matter where it is drawn up, will not supersede DR laws when it comes to how children are considered when it is time to distribute assets after the death of a parent.
If I had the chance, I would have a will drawn up in the DR according to DR laws to avoid any confusion.
Best of luck getting a conclusive answer to your main question. I am not surprised that you are not getting a conclusive answer.