Add flags to the posts when viewing an archived thread on Desuarchive

Desuarchive flags.user.js

// ==UserScript==
// @name        Load /mlp/ flags on Desuarchive
// @namespace   https://desuarchive.org/mlp/thread/
// @description Add flags to the posts when viewing an archived thread on Desuarchive
// @version     1.0
// @author      Anonymous
// @icon        https://s.4cdn.org/image/flags/mlp/anf.gif
// @match       https://desuarchive.org/mlp/thread/*
// @run-at      document-end
// @grant       GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    GM_addStyle(`
        .post_poster_data img {
            display: inline-block;
            width: 16px;
            height: 16px;
            position: relative;
            top: -2px;
        }
    `);

    function addFlag(post) {
        if ("exif" in post && post.exif !== null) {
            let exif = JSON.parse(post.exif);
            if ("troll_country_code" in exif && "troll_country_name" in exif) {
                let board_flag = exif.troll_country_code;
                let flag_name = exif.troll_country_name;
                document.querySelector(`article[id='${post.num}'] .post_poster_data`).insertAdjacentHTML('beforeend', `<img
                    src="https://s.4cdn.org/image/flags/mlp/${board_flag.toLowerCase()}.gif"
                    alt="${board_flag}" title="${flag_name}" referrerPolicy="no-referrer">`);
            }
        }
    }

    $.getJSON(`${backend_vars.api_url}_/api/chan/thread/?board=${backend_vars.board_shortname}&num=${backend_vars.thread_id}`, data => {
        let thread = data[backend_vars.thread_id];
        addFlag(thread.op);
        for (let postId in thread.posts) {
            addFlag(thread.posts[postId]);
        }
    });

})();

Don't know where else to share this so I'll just post it here:
https://files.catbox.moe/ebe8q4.zip

new_captcha.html with a captcha solver implemented, identical to the WASM version of: https://github.com/drunohazarb/4chan-captcha-solver
Works well when injected into Blue Clover's APK and is reasonably fast thanks to the wasm backend. I figured that you could implement this in your codebase better than I could.