Enabling searxng on a NixOS instance is trivial and works well. What are you missing here ?
You’ll get back to it, I’m pretty sure.
I was thinking about that too.
When a software is not available(very rare), I take a bit of time to learn how to package it and then I propose it to the main nixpkgs repository (check https://github.com/nix-community/nix-init). So I can enjoy learning new things and potentially help some other users…and usually updates are provided automatically by rryan-tm bot!
I understand that distrobox might help in short terms, but this is not the solution in the end.
Nix