It is possible to decrypt L3 by dumping keys from an android device. Several guides and tools can be found here: https://cdm-project.com/How-To.
I have done this successfully in the past, but it is far from easy.
As an alternative for using an Android device with some hacking tools, you can use https://getwvkeys.cc/, but you need to sign up and get accepted.
One does not exclude the other. A ZFS pool with mirrored drives is also RAID.