Splines at end of grid lines

Hi there.
We are flying a multicopter with a payload.
We need to design that makes said payload swing as less as possible during the survey.

This we achieve through drawing spline points at the end of surey lines. However I would like to have this sort of automated through the Auto WP feature.

I kind of found a workaround through using overshoots, saving the WPS, editing their type to 82 (spline) and reloading,

However, their orientation can’t be changed.

Idealy I would like to have the copter make a slight curve to the left, followed by a large curve leading into the next survey line( that lies to the right).

Any experience with this?