Not sure. But I contemplating making the bike with a hanger so it's an option.
I would like a 2 or 3speed with MTB derailleur and trigger. Not sure if that exists. On the other hand single speed is fine for now. There are so many skills to train before ramping up speed.
So you're going for gears in this case? Can't remember when I learned to use a shifter but definetely I wasn't that young (or that cool)