Can you show me pictures of those you mentioned?Yes, Parcoblatta are getting more common in the hobby and are very easy to keep. However, they aren't that great for handling. Try Blaberus or Hemiblabera, I own both and they are great pet species, both get pretty big, and are very good for handling.
Ok, sounds like you'll be fine then! Good luck with keeping whatever roaches you end up choosing!Substrate is fine as long as I can keep them in a small glass tank (10-20 gallon) my hissers breed like crazy and now I have too many that's why I no longer keep them in a glass tank with substrate still I prefer a dry envioment with egg crates/card board/newspaper/empty paper rolls.