This is about the best and most intuitive solution you could come up with to this problem. Sadly I believe the Samsung Galaxy S4 was the only phone that supported this without an S Pen so you could simply hover over the screen with your finger. I wish it was a standard feature on all phones.

I think most of the current displays can detect a finger hovering over the display but not necessarily touching it.

It might be a complete disaster though, just wondering how that info could be used.

The first doesn't exclude the second. That's the way how https://xkcd.com/ is doing it. It just shows both.