There was a good idea in Valentin's gym press (more for coaches not for home, sorry). Have them do it on P-bars, holding one (from the outside) facing the other, inverted hang and try to hold for however long without touching either bar.a. invert cradle/candle holds on bar. once you master this, work on holding it with your body not touching the bar ( towards a true front lever, honestly I'd like to see 15 degrees forward of the bar ) can be down on a low bar or pullup bar ( if there is enough clearance ).
Actually, an athlete shouldn't touch the hips on the bar until the upswing on a back hip circle anyway. They should also be pushed up in an exaggerated, extended front support to slow down at the end. If they are trained this way, 9 out of 10 kids will accidently do a clear hip anyway. It just takes a lot of time, patience and constant corrections.The issue is most likely some combination of the cast not being high enough and not dropping the chest back early enough. Unlike a back hip circle, where the shoulders essentially don't move until the hips contact the bar (technically just before the hips contact the bar), in a free hip the shoulders must be pulled back aggressively on the way down from the cast, without waiting for the hips to get back to the bar.
Sometimes I think we do kids a disservice when we teach them back hips as a progression towards free hips, but I can't really think of any alternatives I like better.