Doesn't make sense for high school. I'm a fan of a team that returns some kickoffs for touchdowns and has a history of converting a decent number of successful onside kicks. Both are exciting. Both are inherently dangerous. High school football is supposed to be about developing kids. Time wasted on coaching special teams return coverage is just time that could have been used developing kids for scrimmage play. As fun as it is to watch a third string linebacker playing special teams make a big hit, it's not safe for a kid who is still developing.
I say move the kickoff back to the 35. Receiving team must remain at least 15 yards past the point of the kickoff or be subject to a 5 yard off-sides penalty with an automatic re-kick. Ban on-side kicks and kicking team unable to recover or take possession of anything but a muffed kick reception which is treated as a non-advanceable fumble. Other than in the end zone - if a player from the kicking team touches the ball, it's dead there regardless of where and the ball is placed there with possession to the receiving team. If kicking team touches or catches in end zone, it's a touch back. Receiving team is always in fair catch mode - no need to signal and standard catch interference rules apply. For the receiving team, every player is a receiver. Kicks that hit receiving team players before the ball has traveled 30 yards are downed at the point of contact. Receivers who deliberately place themselves to be hit or try to bat down a low kick without an obvious attempt to catch the ball are penalized 15 yards for unsportmanlike conduct. Receivers are not allowed to return the kickoff. Where they catch the ball is where the ball is placed unless it is caught by receiving team after the kick advances past the 20 yard line - then it is a touchback with the ball placed at the receiving team's own 20. Balls that roll dead without catch or downing by the kicking team are placed where the ball stops. If the receiving team opts against trying to catch the kick, they risk having the ball downed inside the 20 - so they have to make a try to "catch" the kick. Receiving team is allowed to block. Kicking team is banned from initiating any contact and penalized with catch interference unless inadvertent. Balls kicked out of bounds inside the 35 are placed at receiving team's own 35. Balls kicked out of bounds before the 35 are placed where the ball went out. Allow kicking team to forgo the kickoff and give the ball to the opponent at their 35. Don't punish them for not having a kicker or a kicker who can't kick more than 30 yards. Reduce the kickoff to a glorified practice for the kicker to kick as deep as possible and the kick "returners" to catch and secure the ball cleanly.