That said, I think I found a decent middle ground step. Using environment.etcconfig in the installer configuration.nix; I should be able to setup scripts and configurations to be available on the installer. Once the install process is complete I should be able to mount the new installed partition and copy over the required files to setup the deployed environment. Might even be able to write a script that can be run in the installer to do all the post-install process 
2 Likes