I think all those are great points and I agree with all of them. 

I am probably gonna probably write Harry in with Ginny like they were in the books. They would have dated, he broke up with her, and then they kissed once again in her room before he left with Hermione and Ron. He is going to yearn for her a bit, but it will take a back burner. There will be so many other things on his mind that she will be easily forgotten.

Depending on his argument and the way he approaches her, I could see Luna coming willingly with Draco. It depends on the circumstances.

So this would start at the beginning of the 7th year, on the train. Also, we would start Harry, Hermione, and Ron off after they have ran off?