Teach them the drop part of a drop kip and then teach the drop in a narrow stride position.
Set up men's p-bars to resemble the old fashion women's bars, or set up something else with some object and a single bar...... have the kids grab the upper bar and rest the base of their butt on the lower bar. From there they exrend into a very slight bow/arch (hips) and then pike quickly like they'd do to make a kip, but have them shoot the single leg and kip with one leg on each face (front and back) of the rail.
It's a swing skill so focus them on that fact before they get set in their head that they need to push the bar to come up. Kinda like it would be a mistake pull up instead of swinging during an uprise.
