git/buildGoModule + private repositories

A hack, but works to bring in SSH access and configuring go/git to fetch private dependencies. Is there a better way?

package = with pkgs; buildGoModule {
    pname = "project";
    version = "local";
    src = nix-gitignore.gitignoreSource [] ./.;
    goPackagePath = "path/to/project";
    subPackages = [ "cmd/thing" ];
~   vendorSha256 = "sha256-EtmOMdxN1/bI1ySaQNsy2SBFIu5htDxzWHPjzGb5ynQ=";
    overrideModAttrs = old: {
      preBuild = ''
        export HOME=$(pwd)
        cat <<EOF > $HOME/.gitconfig
~       [url "git@gitlab.company.com:"]
~           insteadOf = "https://gitlab.company.com/"
        EOF
~       export GOPRIVATE="company.com"
        export GIT_SSH_COMMAND="${pkgs.openssh}/bin/ssh -o StrictHostKeyChecking=no"
        '';
      impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ [
        "GIT_PROXY_COMMAND" "SOCKS_SERVER" "SSH_AUTH_SOCK"
      ];
    };
    buildInputs = dependencies;
    nativeBuildInputs = [
      pkgconfig
    ];
  };