I'll caveat this answer by saying I have very little knowledge of the RAF's medical branches, but in ahem years service, I think I can only ever remember seeing one or 2 Medical Officers who wore Wings - and that was during a trip to the decompression chamber at North Luffenham as it was back then.
If we do still have MOs that fly, I can't see it being a full career stream, more a lucky posting after which you would probably go back to diagnosing bad backs, sprained ankles etc.
And frankly, with the number of aircraft we now have, coupled with the lack of money, it all means that front line crews for whom flying is their core duty are struggling for hours so I can't see there being many hours available each month for an MO to stay safe let alone competent. However, I am ready to stand corrected, but somehow I think you're going to have to make an either or choice.