I've thought about bringing discussion to the Epicurean subreddit, but the bulk of its users seem to be (like you said): spiritualists, eclecticists, and non-Epicureans, the most widely spread post is the so-called "Epicurean paradox".
It's a bit of a shame as I would like to see it flourish like r/stoicism as reddit is much more accessible compared to a great number of other sites. Maybe some integration is in order?