Hi, I can add the parental gate to you app to get approved by Apple. I have done this before where we have a popup view that says "Swipe Left with 3 Fingers to access" the view uses a random direction, Up, Down, Left or Right and random amount fo fingers needed for swipe 2 - 4.
Only the correct gesture will unlock and this has been approved by Apple in the past.
I will create the view programatically - I can make the view, border, mask, fade and label in code. Any images you provide I can add too.
Please feel free to get in touch anytime.
EM