If he isn't good to play reds, what's stopping you taking him to play in the under 15/17s in the turf comp on a Sunday... they get proper umpires, play every week on turf.
So do 16 whites Mickey, and many reds and whites players do play back at their community club on the Sunday. They also get to train of turf 2 nights a week, have access to quality coaching (in the most part) and push for selection in the reds.
There is a big difference in batting technique in particular when comparing a kid who has been involved at a grade club since he was 12 than a kid who comes to a grade club as a 15 year old. There will always be an exception to the rule with a truly natural young player.
The notion that a kid would be better off playing against men is so far off the mark especially in a lower grade ATCA or PDCA comp. They would learn nothing, gain nothing but bad habits, young leg spinners would be non-existent.
The junior system is fine; if clubs wanna do the work, provide quality coaches (not parents), run trials and ID talent from community clubs - the best kids are identified, provided with good coaching and kept in the system while developing be that in the white or reds grades.