I’m not sure I completely understand what you are describing, but if it would injure a child when it closed, it will be against building safety codes.
There is also the question of how much strength is required to open it.
If you angle the track only at the top, then there will be a light gap at the bottom of the door when it closes. If you angle the track at the top and the bottom, it is likely to become a tripping hazard. 
There are many door closers on market, some that are smart and some that are manual. Home Depot should have a selection of the non-automated ones. I don’t know of any of that require an angled track, almost all of them are designed to close existing doors.
I have answered you in more detail in your other thread: