Not sure if you're still looking for ideas. I never used headspring drills for front handsprings. The gym I'm at does and I notice their kids have a hard time NOT ducking their head in both their front handsprings on floor and on vault. I use front limber drills (not always so easy for boys). They do front limbers off mats and going uphill.
Using panel mats, I like to have them do front handsprings not just on (as many will try to tuck to get on) but also half on, half off. They will run and put their first foot on the mat and their hands and land off it. Or, they may just put their hands on. Or they can put hands on and land on the mat.
I also like doing a drill where you put a springboard in front of a cheese mat that is against the wall. They then take a couple of running steps to it and put their hands on the springy part of the springboard and block off, touching their whole body to the mat (or you can do just toes - this is also a good vault drill if you incorporate an arm circle). If they duck their head, they will land on it because their shoulder angle will close (of course). If they keep their focus on their hands, they will land back on the board in a nice handstand position.
Hope this helps.