Focus on being the most competent critical care provider you can be, no matter what your discipline, and all doors will be open to you.
Doing things specifically to get on a flight program are a big turn off to a lot of interview committees. Most places want a well rounded provider, who is not enamored by the mode of transport, but more so the opportunity to practice critical care in a dynamic environment.
So the bottom line is, if you intend to go back and get your RN, I would plan on at a minimum of 3 years in a high acuity ER (or preferably an ICU with part time ER experience) and then you might have a shot at a second call. If that 3 years experience is all you have, I would not expect a job offer.
Any place that is willing to hire you with less experience should be looked at very objectively. If a flight program can not attract applicants with a high degree of experience, and they are looking at providers with less than 3 years within their discipline, they likely have problems...remember, your time as an EMT-I will probably not matter when they add up your experience.
Look at the helicopter as a mode of transport. Nothing special about it other than the fact that it can be used in a very narrow set of circumstances to expedite transport to the appropriate facility. The same care can be (and is) provided int he back of ground units every day.
If you give off the impression that you are desperate to become a flight nurse/medic, employers can sense that, and they usually shy away. Focus on being the best you can be, and let them chase you...