Excuse me for butting in. NY must be way different than Texas. There are a LOT of ex-college coaches in coaching high school and all of the coaches look for every edge they can get.
Also the 25/40 clock will make all R's jobs easier once the crew and time keepers get the hang of it.
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There are former (NCAA) Coaches working at the NFHS level in New York, and I suspect adapting to the different rule structure is as difficult for them as it is with officials who are currently, or have previously worked, and gained experience under both codes. Some adapt and/or transition better than others.
Texas, using the same code at both levels likely makes transition less complicated. As for the 25-40 second play clock conversion, time will certainly tell. I hope you're right. For the time being I suspect a considerable majority of games will be played without benefit of field play clocks, utilizing 5 man (sometimes 4 man) crews.