I'm building a Skyblock server for multiple friends, and would love to have a feature where a new player can push a button, trigger a command block, and clone a new, clean skyblock world. Ideally this would be done with an adaptation to the clone command:

/mv clone4me {world_to_clone}

This would be the equivalent of

/mv clone {world_to_clone} {player_name}

if you want to use command block to replace something like @p to the actual player name you should use a plugin like:
PsudoCommands: https://www.spigotmc.org/resources/psudocommands-add-the-function-to-plugin-commands.56738/
CommandHook: https://www.spigotmc.org/resources/commandhook.61415/