You cant offically remove bixby you can remap the bixby button and turn off the Bixby Home screen if you want you. The only way to do something like your referring to be to use a package disabler but you would need to join some place like Sam Central for help with that .
It seems all I can do is repeatedly go into apps and force stop it, but it continues to reinitiate both Bx Home & Bx Voice. On the S9 the Bx button can only be restricted to a double tap to activate, but this requires Bixby to be running. I hope Samsung's developers come to recognize that not everyone wants an assistant service and will release a package that allows us to disable or erase it. I would hate to have to abandon Samsung just because I don't want an assistant.