How to enable my python module on Unbound?

Question

I am programming a small python module for Unbound, nothing serious at all.

https://framagit.org/22decembre/ipv6-dns-proxy

The trouble is, I cannot manage to start unbound with it on the two environnements I can access : my openbsd server (I needed to compile Unbound because Unbound in base does not have python support compiled) or a debian based desktop (debian bookworm).

Here is my what happens on OpenBSD :

stephane@blackblock:/home/stephane export PYTHONHOME=/usr/local/lib/python3.10/                               
stephane@blackblock:/home/stephane echo $PYTHONHOME                                                           
/usr/local/lib/python3.10/
stephane@blackblock:/home/stephane doas /usr/local/sbin/unbound -d -v                                         
[1690784738] unbound[76230:0] notice: Start of unbound 1.17.1.
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = (not set)
  program name = 'unbound'
  isolated = 0
  environment = 1
  user site = 1
  import site = 0
  sys._base_executable = ''
  sys.base_prefix = '/usr/local'
  sys.base_exec_prefix = '/usr/local'
  sys.platlibdir = 'lib'
  sys.executable = ''
  sys.prefix = '/usr/local'
  sys.exec_prefix = '/usr/local'
  sys.path = [
    '/usr/local/lib/python310.zip',
    '/usr/local/lib/python3.10',
    '/usr/local/lib/lib-dynload',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x0000030be8ccbb18 (most recent call first):
  <no Python frame>

On Debian :

stephane@penguin:/tmp$ sudo unbound -d -vv
[1690788306] unbound[14200:0] notice: Start of unbound 1.17.1.
[1690788306] unbound[14200:0] debug: switching log to syslog
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'unboundmodule'

I tried to install everything I need there but apparently, I am wrong ?

How do I solve that ? Thank you.