I believe you have the ability to set one walkway, which to me, is not a great limitation.
Passengers will always walk around the wingtip or the cones to the rear entrance.
In the case you pictured, I would stop the walkway at the end of the painted walkway on the ground.
Passengers will find their way to both entrances in an orderly manner.
By the way. In the example you showed, It would be best to get the first point inside the building so that passengers are generated out of sight. Then, one point outside the building, and they can come down the ramp and around the corner with extra points.
I'm having a great time updating all of my Orbx P3d Australian airports.
A fantastic update.
Aussie