Obosob is one of the main mods from the ergo mech sub and they are running https://lemmy.ml/c/ergomechkeyboards@lemmy.world. (I don't know crosslike communities on here yet) but that sub is picking up. There is also https://lemmy.ml/c/mechanicalkeyboards. Both are gonna be slower than what reddit was like of course but I kind of like that. I haven't seen much trackball stuff yet but right now there is a Fingerpunch board on the first page with one. I saw a Cirque build the other day too. and a hand full of sub-40% boards including one of mine!