I think you can create module with needed functionality based on Groups, you can use existing Groups module and just changes language strings, blocks, fields, menus in Studio builders. Or clone module and use it under your own name. But second variant will cause that your custom module will not be updated (or you will need to do it manually) and you need some programming knowledge to do this, however it's build on some common files and some functionality will still be automatically updated with the version update.