What’s the difference between getting killed at a flight path versus getting killed anywhere else? You can’t ban PvP on the basis that it is “cheap” or “unfair”, because then there would be no wPvP. Honorless target is enough.
You’re not entitled to get to access every zone you want as conveniently as possible at all times. If flightpath camping triggers you, fly into Hinterlands before going to EPL and take a few extra minutes getting there.