I’ve put together a couple of home-manager default.nix’s for ect and pdfsizeopt: ect and pdfsizeopt for nixos's home-manager · GitHub
It’s image and pdf optimization stuff that depends on old and problematic code (2012 ghostscript, python2 and a half dozen image decoding and encoding libraries with known vulnerabilities… there’s even a few licensing issues with some stuff here and there.) that I only feel comfortable using on stuff I wrote myself so I’m not going to submit it. Regardless, if anyone wants to use it or whatever…
Best of luck