Hb1hf Wouldn't recommend any of these options.
Hb1hf If you don't want to use fdroid, you can use NeoStore or Droidify clients. I'm not sure if they solve all the issues with the original F-Droid client.
These clients lack mirror support which puts unnecessary load on F-Droid's main server. Unless mirrors are supported you should not use a third-party client. Additionally it is another party you need to trust.
Hb1hf If you still don't want to do it, you can use Obtanium.
Obtanium is a web scraper and doesn't verify any F-Droid metadata. It would be better to use a client for this.