Hi folks,
an idea, as I have just personally subscribed to the RSS feed of new topics: Use Hubot to subscribe the RSS feed of latest Discourse topics and post them go #general (or another, tbd channel) on https://open.rocket.chat.
Possibly with a note:
Oh look! There’s a new topic on our Discourse platform: [URL from feed, Link text = title from feed]. Care to weigh in?
Cheers
Thomas