I have a cracking idea.
• You might be able to cheat by passing a reference to a separately handled UNIX socket.
• Alternatively, make your external thing a C node and integrate Erlang Distribution (i.e. change the design). Still, have your Elixir app spawn & manage it, possibly via saleyn/erlexec or some other libraries that were proven to be robust.
Making the external thing into its own C / Java node, is a viable option, and I have used this approach with great success.
