I’m not sure if you’ve tried this PWA called Wefwef but it feels like a fully featured Apollo client for Lemmy already. You just go to the site and add it to your home screen. No beta to sign up for. No TestFlight link. Just add the PWA.
It’s good. It’s really really good.
Apple doesn’t allow other browser engines on iOS, so you’re using a skinned Safari, with some features on top.
However, for a PWA you don’t need the FF features, so just open it in Safari -> share -> add to homescreen.