I have an award booking JFK-CDG-MXP next year. Want to add a positioning flight ATL-JFK on DL which I will purchase either from DL or VS, as I have miles on both. Is there any way to add these to the AF booking so my bags are through-checked? Even better option: would AF add the flight if the flight becomes available through AF?

As background, I needed to book the long haul as soon as awards opened to get the best rate, but the domestic positioning flight wasn't yet available on AF. Worst case I will get the bags at JFK and re-check in, but would like to avoid that if possible. Thank you.