TBH, I am not sure about starting CZ/SK forum, there are some cons, it would definitely divide existing community, but on the other hand, it would provide a forum to people who don't speak English well or not at all, I personally don't feel like starting a community as I am an introvert who doesn't like to talk with outside words, etc.
But I think it's worth giving a try. It could certainly be a nice place to chill, so count me in!