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Newdude/Oct140,
I had opted for AOS in my I-140 application. Later on, I asked my attorney to send a letter requesting a change from AOS to CP at New Delhi. My I-140 got approved for CP. Also, even before my I-140 was approved, I applied for my I-824 receipt. I got my I-140 approval and I-824 receipt almost at the same time (actually I-824 1 week before I-140 approval).
To save more time, I applied for AC-140 at New Delhi and the application got accepted and have been promised interview in the week of Feb 4. Meanwhile, NVC also created a case for me (separate from AC-140 case #) and sent me Packet 3 which I am holding on and not filling it out.
In summary, you can file I-824 before I-140 approval and also apply for AC-140. The NVC case process could run in parallel and would have any impact on your AC-140 case.
Hope it helps.