The CNIL gave up 3 years ago, and gave guidelines, you can read about it here [0]. At the time it read like "How well, we tried, we said it is incompatible with privacy and the GDPR multiple times, we insist one more time that giving tools to parents is the only privacy-safe solution despite obvious problems, but since your fucking law will pass, so the best we can do is to draw guidelines, and present solutions and how to implement them correctly".
I think the EFF should do the same. That's just how it is. Define solutions you'll agree with. Fight the fight on chat control and other stuff where the public opinion can be changed, this is too late, and honestly, if it's done well,it might be fine.
If the first implementation is correct, we will have to fight to maintain the statu quo, which in a conservative society, is the easiest, especially when no other solution have been tested. If it's not, we will have to fight to make it correct, then fight to maintain it, and both are harder. the EFF should reluctantly agree and draft the technical solution themselves.
[0] https://www.cnil.fr/en/online-age-verification-balancing-pri...