Thanks for the reply. I will probably buy an airbag jacket before the new season starts and if it will be one from hit air (which is the prevailing idea for me right now), I'll certainly try to enhance it.
You could at least offer it as a separate option. Some fall arresting devices are not that expensive (ref ) and those are made to certain standards (ref ) so your Japanese partners could talk to someone who already dealt with these problems and learn from them or strike up a collaboration.
In any case, thank you for your reply & interest.
 - 130$ on the client side, so it must be much lower for production price
 - they have to withstand serious wear & tear, plus, work even if they're covered in oil or gunk and usually come equipped with a service life indicator, which shows how much longer it's going to fulfill said standards