Matthaios it's a bit difficult to answer you fully, given the no current politics rule (which I understand)... but I think I can say that there is a danger in thinking that EP leads to one political position or even a narrow range, because individuals take pleasure in different things. What looks like painful selflessness to someone else can feel like pleasurable social connections to others. Remember that meaningfulness is often one of the strongest pleasures for humans! I have had in fact opportunity to speak to many young people over the past year, whom I suspect may be in the group you are worried about, and I'm happy to say that they understand and practice EP principles easily! Even though they don't call it that. I've had some great conversations with them. Where I reached them was in person, at community events, and after that I connected online.
There are a lot of nonpolitical online places a modern Epicurus might show up besides history and philosophy sites, which don't get as much broad interest. I think Epicurus today would definitely be on physics forums, where there are mostly atheists already, reminding them about pleasure, but that's still narrow. I can most easily imagine him going to health-related online groups, physical and mental, talking about how health has no value apart from pleasure (just as nothing else has value without pleasure). Lots of people of all ages are interested in health, and what they really want, even if they don't articulate it, is physical and mental pleasure. Health is the most common modern day framing I know of for happiness-- it has become religion-like for many people.
He might use a range of platforms but I suspect given his writings that he didn't personally enjoy politics so would probably not show up on the platforms that are heavily political. However, those of us who enjoy politics can engage wherever we get pleasure engaging. I certainly do!