Hi,
what do you think about creating a F-Droid repository for e/OS system apps like Advanced Privacy, Browser, WebView etc.?
This is the best way to keep your system up to date and secure if your device is no longer supported by /e or you run an unofficial build of /e. DivestOS and IodeOS are doing it the same way.
Creating and hosting the index could also come from outside of /e/OS. As @Saijin_Naib said, AppLounge support for custom f-droid indexes would be great to bootstrap, but I guess one can stomach installing the F-Droid client.