Welcome to Rokkenjima little seacat!
Have you tried reading other works like Higanbana no Saku Yoru ni or Rose Guns Days? You might enjoy those too.
We have lots of gameboards around, actually there are 3 currently active: “The Chain of the Impaler”, “Bernkastel’s Last Bow”, and “The Evening When The Cards Fell”, and if you don’t want to try catching them up, you can also make your own after achieving witch rank, and with this rank you’re also allowed to join the discord channel.
We also have threads discussing WTC 5 where you can post your own theories about it and see what other members are thinking about it.
Now, about your last part: We’re a friendly community and would never burn anyone at the stake, even if you talk about Rosatrice theories. Actually all theories are very much encouraged around so the worst think you could worry about is to have over 100 notifications if you start such a heated topic and stay away for too long.
Enjoy your stay!!