Ok, at the end I "built" them:
At the left two "original" china stick, at the right two tent pegs made from them.
To get them stronger, I've taken away the original tip and I've made a blunter one.
The hook for tent wire is made with a cable tie.
Each peg weights 4.5 grams... I've tried them on hard terrain, and they seems to work well (only with just a little attention when hammering them)