EDIT: Images an non applicable questions removed to continue the thread on topic.
The goal here is to obtain and automate issuance of LetsEncrypt certificates to @sionicion's network. So it is on topic and within the scope of this forum.
Although I have successfully managed (Novell) clusters on municipal networks, I am not experienced with Kubernetes clusters specifically. There is a "certificate manager" involved here which is not part of pfSense distro. This may be complicating the process and I am convinced that we can get to the bottom of it and make this work for the OP.