Clojure CLI doesn't have such control. But when clojure starts the REPL, it loads user namespace at the very beginning. Typical setup would be to create something like dev/user.clj file with:

(ns user)

(require 'your.init.namespace)
(in-ns 'your.init.namespace)

:dev {:extra-paths ["dev"]}

I tried this and din't work 😕. Not sure if I done something wrong but debugging de nREPL output the command that is executed is something like:

java -Dclojure.libfile=<path>.libs "<params-like-useragent>" clojure.main -i <path-to-private-var-folder>.clj

odd, looks like your repl starts correctly but for some reason in-ns doesn't work

You may want to ask in the #C0744GXCJ channel.

I'll do that. Thanks for the suggestion