Is it permissible to say "by the grace and help of Allah" in the context of a worldly endeavor with a non-Muslim?

There is no objection to writing the name of Allah Almighty in a letter to a non-Muslim, especially if they are from the People of the Book. Indeed, the Prophet, peace and blessings be upon him, wrote to Chosroes and Caesar, and his letters included the name of Allah and verses. Likewise, Solomon wrote to the Queen of Sheba, and his letter included the name of Allah. However, if it is known or highly probable that the name will be disrespected, then it is not permissible to write it.