The question has now been solved thanks to a hint of using a Service Provider, so after some googling I found a good match with a Service Provider that loads config files, that way I can just use the original Laravel hashing config in Lumen to change the hash drivers from Bcrypt to Argon.
So if anyone wants to use Argon instead of Bcrypt in Lumen, here's a repository for it; github.com/thinkverse/lumen-hash
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