Before doing this kind of marketing, do the essential updates first and companies will blossom all over the country.
[1]: https://en.llri.lt/wp-content/uploads/2017/12/Employment-Fle...
No severance package - yay for flexibility! I'm not saying you should pay a lot, but 1-2 month's salary after 5 years with the company and 3-6 after 10 years shouldn't kill the company and should provide a respite for the just-fired loyal employee. By the way, in your index the country would get a 100/100 when it has no severance package.
No extra payment for overtime - again, this seems like abuse. This would be 100/100 in your index but I don't really see how it can be justified. Same with the time restrictions for overtime.
Paid annual leave - ...
It's one thing to be overbearing and another to offer decent social support to employees (I find France overbearing).
(I'm one of many french engineers who left France to have a decent career)
At the same time, the points that OP makes are still valid :). For someone that wants to open a company, social aids and healthcare access can matter. Other countries are more open than France is, but it doesn't make France a black hole where nobody can make a good career. The Paris tech scene is most alive.