forwarders are already possible.
They are not always called forwarders, but also "nro loaders" or just loaders.
Look here :
https://gbatemp.net/threads/homebrew-menu-loader-legal-nsp.518433/
this is a "hbmenu.nro" loader.
if you follow the link to the sources, you can build any other forwarders by editing the path to the .nro to load, and edit the titleID of the generated channel.
if you create a forwarder, or even any nsp, please provide the TitleID or update that wiki page :
https://wiki.gbatemp.net/wiki/List_of_Switch_homebrew_titleID