I made my own bungee line: video below starting at ~ 4:20
Primarily to stop being slapped when pumping to take off, but also to allow pumping the wing while hooked in without unhooking by mistake.
It's made with a thin bungee to avoid the wing bouncing in the gusts, and retract it when not in use.
With a thin Dyneema line inside so that there's a set "extended length" and is indestructible.
And the cover of a regular rope with core removed to hold everything together.
I found that different cover have different weight and heavier ones are a bit easier to "throw" in the hook, but lighter/thinner ones can compress much more if use with a shorter bungee.