Dude. Stop and think for a moment. If I am able to render anything on the screen at all, it means I’m the foreground app on iOS. I don’t need to fake being a keyboard, because I can use the real thing Apple provides. So no, I’m not saying it’s impossible if I can render anything at all, what I’m saying is that outside being the foreground app, rendering anything on screen is impossible outside very tightly controlled interfaces (like custom keyboards that this thread was about before you side tracked it).