I guess you know about matter bridge GitHub - 42wim/matterbridge: bridge between mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat, twitch, ssh-chat, zulip, whatsapp, keybase, matrix, microsoft teams, nextcloud, mumble, vk and more with REST API (mattermost not required!) it could do the Slack<>Matrix bits.
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