I don't usually type the "https://" part if I'm spelling out a URL, and I type many more identifiers than URLs anyhow.
AnySoftKeyboard¹ has this²; the button disappears with the suggestions but the setting only "sticks" until you dismiss the keyboard.
1: https://anysoftkeyboard.github.io
2: https://i.imgur.com/CE1xeGY.jpeg
I don't usually type the "https://" part if I'm spelling out a URL, and I type many more identifiers than URLs anyhow.