One thing to keep in mind here which is super important, people will go where the core team / key members go. I can not stress this enough. That is pretty much all there is to it.
If core team / key members only interact in Slack people will stay in Slack regardless of best wishes, plans, categories on Discourse and 1000 shiny features.
So, the first thing I would worry about is getting buy-in from the rest of core / key members.
Some ideas of increasing involvement here could be:
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What if some “larger” not exactly an RFC but something that needs complex discussion went here for open discussion by core?
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Can/should core make use of private categories to discuss particular things they need to that are too early to bring up in the wider format.
Another trick that I use on Twitter and Chat quite often is:
Wait a moment I really want to answer it but do you mind asking on [insert discourse site]
I find interrupting the flow is very powerful so that definitely a tool you should consider. I will do this multiple times a week in our chat.