Probably not, though discussing this, can't exactly avoid the how of him getting elected. I think that would be dependent on the South not walking out of the Convention; if they can hold their nose and stick with Douglas, then that avoids the problem of Lincoln getting the presidency without a Southern vote being cast in his name. The south was totally overreaching with their demand for a federal slave code; Douglas was probably the most realistic choice. He's certainly better from their POV than Lincoln. It's not hard to see how a man who would include their slaves as a party to the Declaration of Independence, thus giving them the implicit right of revolution, would be unacceptable to the south, especially after he announced his belief that the Union would become all slave or all free.