Don't know if it handles the forks but I've used The Unarchiver on Windows for sit.hqx, should be available on Linux at least through https://theunarchiver.com/

Don't know if it handles the forks but I've used The Unarchiver on Windows for sit.hqx, should be available on Linux at least through https://theunarchiver.com/command-line https://theunarchiver.com/command-line