They will not be backported or should we rather delay Turris OS 6.0 as much as we can and stay on the outdated OpenWrt version for a longer time? I don’t think so. If you are willing to help, you might want to send us a pull request.
Also, your posts are off-topic in this thread. You should create your own thread for such issues.
Nope, I see that libnss is compiled in the HBL branch in today’s build.