How to install deb or rpm

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quiterss depends on qt5 (insecure), and doesn’t seem to have had any github action in 4 years. Wouldn’t be surprised if it gets removed at some point. local-by-flywheel is probably doable. You have the AUR buildpkg. Here is a starter template:

let
  pkgs = import <nixpkgs> { };
  package =
    {
      dpkg,
      fetchurl,
      stdenv,
    }:
    stdenv.mkDerivation {
      pname = "local-by-flywheel";
      version = "9.2.8";
      src = fetchurl {
        url = "https://cdn.localwp.com/releases-stable/9.2.8+6882/local-9.2.8-linux.deb";
        hash = "sha256-b3J6RurIOIFEWVKjXmHG7APOe9pccfQ3EaEHlpR9IoI=";
      };
      nativeBuildInputs = [ dpkg ];

      installPhase = ''
        mkdir $out
        cp -r . $out
      '';
    };
in
pkgs.callPackage package { }

running nix-build (assuming you copied the contents into default.nix) will give you a derivation that contains the unpacked deb file. The rest of it is up to you or anyone else that wants to pick up the torch and do the rest of the work.

EDIT: on the theme of escape hatches, you could also spin up an arch distrobox, and run AUR packages out of there.