Yes, I did this from the uk and flew out 1 Jan. I think I put Qatar originally on the visa application but changed my mind and flew with Emirates in the end. It’s only a problem if you change the details after you get your COE as then you will have to notify the embassy and get a new one.
I just put the flight number and ASQ that I intended using. Once my visa was approved I booked and paid for both and when I had the confirmation applied for the COE.