Wikimedia Telegram channels are currently bridged to IRC via Bridgebot / matterbridge, and that works about as poorly as can be expected: text gets over but nothing else, and all Telegram users (and on the other end all IRC users) are shown under the same account.
We should try bridging Matrix with Telegram, either via matterbridge or mautrix-telegram (either t2bot.io or self-hosted).
IRC bridging would then work via the relatively high-quality (e.g. puppeting-capable) Matrix-IRC bridge.