You do know that NordSec maintains its own rust fork of BoringTun: https://github.com/NordSecurity/NepTUN ? :)
There is also https://github.com/firezone/boringtun which is a fork by https://www.firezone.dev/
There is also https://github.com/firezone/boringtun which is a fork by https://www.firezone.dev/