As an OLD former pilot, the approach I enjoyed most was the old GCA or PAR radar approach. ILS was cool, VOR was ok, and ADF you would occasionally get lucky, but a GCA in marginal weather when guided only by a human voice was almost magic. Here's my proposal. Recreate the Berlin Airlift.
1) Use the old Celle Airfield (ETHC) to Tempelholf (EDDI) Note: one of the real corridors
2) Use GPS DIRECT for mapping purposes.
3) Prop planes only and if you are REALLY cool use the old default DC-3 Army Surplus model.
4) Max Altitude 7000/8000
5) Weather set to 200ft ceiling 1/2 mile vis, fog rain
6) Establish know fixes for holding patterns.
7) maybe have 1 pilot fly a P-51 and occasionally "buzz" aircraft (the Russians did this)
Pretty good actual PAR approach:
I think younger pilots would enjoy old school IFR and the controllers would be busier than a one legged man at an ass kickin contest.