I wouldn't let the single trigger put me off. The kids might find them easier to use. The pistol grip might give them a better hold on the gun. Straight grips require the wrist to be rotated forward more to fully grip. Smaller hands might find that unstable and uncomfortable. Supposedly the straight grip is better for sliding the hand back for the rear trigger. KY Jon has it right, the young'uns probably haven't developed an ingrained preference yet and should have an open mind about it.

Have fun and good luck in your quest!