yes it would take some work to get elixir doing the job. For instance, guile is not default lazy evaluated, but guix is able to use guile to great effect.
I don’t know if elixir’s processes would be “useless” for this kind of task
For instance, mix works great, and is implemented in elixir elixir/lib/mix/lib/mix.ex at main · elixir-lang/elixir · GitHub