Need help repackaging the snapgene .rpm for NixOS

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I have been trying to repackage the snapgene .rpm file, so that I can use it in my NixOS installation (as nobody has packaged it). I have tried to generate as much of this flake/derivation using the aur PKGBUILD as a guide, which has gotten me to the point of a “working” application - it just doesn’t have a working TLS backend, so I cannot activate a license.

I am very new to Nix, but really need this application for my work/studies, and I have been using chatGPT to try to help get me as at least close as possible on my own. But this is quite a large package with many dependencies, libraries, etc. and considering I’ve never packaged an application before, this is extremely overwhelming to try to resolve.

The following is a flake, that when built, will produce a usable application under $out/bin/snapgene:

{
  description = "Nix flake for the SnapGene software";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
  };

  outputs = { self, nixpkgs }: let
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
      config = {
        allowUnfree = true;
        permittedInsecurePackages = [ "openssl-1.1.1w" ];
      };
    };
  in {
    packages.${system}.default = pkgs.stdenv.mkDerivation rec {
      pname = "snapgene";
      version = "8.0.1";
      _pkgver_major = "8";
      _pkgver_major_middle = "8.0";

      src = pkgs.fetchurl {
        url = "https://cdn.snapgene.com/downloads/SnapGene/${_pkgver_major}.x/${_pkgver_major_middle}/${version}/${pname}_${version}_linux.rpm";
        sha256 = "10xqyrzybjy6dfgbzdhjyylm6xnwbqwccw1r1p1312j52cjydf32";
      };

      nativeBuildInputs = [
        pkgs.rpm
        pkgs.autoPatchelfHook
        pkgs.kdePackages.wrapQtAppsHook
        pkgs.cpio
      ];

      buildInputs = with pkgs; [
        qt6.qtbase
        qt6.qtwebchannel
        qt6.qt5compat
        qt6.qtdeclarative
        qt6.qtpositioning
        qt6.qtsvg
        qt6.qtwebengine
        kdePackages.qca
        xorg.libSM
        fontconfig
        nspr
        xz
        expat
        glibc
        gcc
        libcxx
        libcxxrt
        dbus
        krb5
        xorg.libxcb
        libxkbcommon
        xorg.xcbutil
        xorg.libX11
        xorg.libxkbfile
        xorg.xcbutilkeysyms
        xorg.xcbutilrenderutil
        nss
        hicolor-icon-theme
        xorg.libICE
        xorg.libXcursor
        libglvnd
        xorg.libXext
        openssl_1_1  # Ensure OpenSSL is available
        zlib
        llvmPackages.openmp
      ];

      env = {
        QT_QPA_PLATFORM = "xcb";  # Use X11 (or "wayland" for Wayland)
        QT_TLS_BACKEND = "openssl";  # Ensure TLS uses OpenSSL
      };

      unpackPhase = ''
        rpm2cpio $src | cpio -idmv
      '';

      installPhase = ''
        mkdir -p $out/opt/gslbiotech/snapgene
        cp -r opt/gslbiotech/snapgene/* $out/opt/gslbiotech/snapgene/

        # Patch RPATH to ensure OpenSSL is found
        patchelf --set-rpath "${pkgs.openssl_1_1}/lib:\$ORIGIN" $out/opt/gslbiotech/snapgene/snapgene

        # Create symlink to license
        mkdir -p $out/share/licenses/$pname
        ln -s $out/opt/gslbiotech/snapgene/resources/licenseAgreement.html \
          $out/share/licenses/$pname/LICENSE.html

        # Symlink binary for profile integration
        mkdir -p $out/bin
        ln -s $out/opt/gslbiotech/snapgene/snapgene $out/bin/snapgene
      '';

      meta = with pkgs.lib; {
        description = "Software for plasmid mapping, primer design, and restriction site analysis";
        homepage = "https://www.snapgene.com/about";
        license = licenses.unfreeRedistributable;
        maintainers = [];
        platforms = platforms.linux;
      };
    };
  };
}

The main issue seems to be that I’m not telling nix/snapgene how to use the provided openssl backend, as shown by the applications console output:

qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""
qt.tlsbackend.ossl: Failed to load libssl/libcrypto.
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No TLS backend is available
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No functional TLS backend was found
qt.network.ssl: No TLS backend is available
...

I was wondering if anybody would be willing to help me either fix it, or understand the build process well enough that I’d be able to resolve this issue myself. Thanks!