I'm interested in how this would work out. this sounds logical, but I cannot think deeply enough to identify which particular rules in the NFHS are tweaked/invented/implemented to account for the differences in the skills, experience, maturity, and physical stature between High School athletes and those participating at the collegiate and/or NFL level. Other than length of game, quarter, and other time-related changes, can you be more specific as to which specific rules which are acceptable for college and not acceptable for High school aged athletes? In regard to the skills, experience, maturity, and physical stature argument you are presenting?
Are you serious? You're looking for examples of differences (In regard to the skills, experience, maturity, and physical stature) between players at the Interscholastic and Collegiate (not to mention the NFL) levels? You might consider, next time your working a Freshman, Modified, JV or most Varsity HS games take a good look at the players. If possible, when getting to the field takes you through a locker room, notice the players BEFORE they put their equipment on.
Like the NCAA (and NFL), NFHS has a limited, select group of rule specific experts, who have access to a whole gaggle of additional experts and unlimited reference material, studies and practices geared towards making the types of decisions and judgments concerning players and game conditions relating to the objectives of the game, targeted to the Interscholastic level. They also welcome suggestions, advice and ideas about the applicability of rule adjustments SPECIFIC to the Interscholastic level, and make yearly reviews and judgments whether those suggestions are appropriate, or not.
For over 100 years, after all suggestions and ideas are considered, reviewed, debated and assessed rule adjustments are either made, or passed on, to game officials who are charged with implementing what the rule makers decide. Other than being encouraged to share their experiences, impressions, opinions, complaints, support, practicality of final rule decisions, game officials are then expected, and required, to thoroughly understand, accept and enforce those final rule decision, as presented.
With VERY few exceptions, I've found it far more practical, logical and appropriate to accept the wisdom, knowledge, experience and judgments of experienced NFHS rule makers, although should I have a serious question, or see a problematic difference between how specific situations may differ with other codes, I'm aware of the existing process and direction currently available, should I wish to offer any suggestions for improvement.
You might consider that process a more suitable and appropriate source to seek answers to your question.