Question

Suppose a process has now begun that in the near future will develop into a separation. (With the help of the extremists in the current government, whom after all a large part of the people chose.)
Haredim, Hardalim, and street thugs in Judea;
the rest of the Jewish people in the new Israel. (True, it won’t be easy, and even very hard, but the people will understand that this is the reality if they want to remain on this land.)
And suppose that wisely, in the new Israel, they decide immediately upon its establishment to write a Declaration of Independence that will serve as a constitution.
I assume it would be enough to copy and paste the central sections of the Declaration of Independence of 1948, with some language updates more or less.
And they would also add a few new lines—after 75 years of experience—something like a complete separation of religion and state.
What else would the Rabbi suggest including in such a declaration?
Should we say that the role of the state is to lead toward a society that is “a light unto the nations,” or at least an exemplary society?
Are there other things that could guide the foundations in a good direction?