Slingshots = bombproof = urban myth !
maybe back in the day, but between myself and two of my mates flying Rallys and RPM I reckon we've financed Neils last Indo trip
But really, crash any kite face first into the drink over and over and you're gonna hurt it.
Crashing is fully acceptable ( for you), but you've gotta keep the kite in the air.
You may just have to accept that you're gonna need to budget for more kite$ than the average dude mowing around you.
( ask if your local store wants to sponsor you, sounds like you're getting a name for yourself out there.)
Good luck with the progress, sounds fun!!!