It's 23 feet, 4 inches not 23.5.
As I see it, no coaches agreement is required. Rule 1-2-5 and CB 1.2.5 discuss this. If they were adjustable, then they must be moved to the correct spacing. Else you play the game as is or don't play it at all.
Your kicker already had an advantage because of narrower inbounds marks. A college field, these are 60 feet from the sidelines as opposed to 53 feet,4 inches. Any complaints about that?
Games are played at fields marked for NCAA games all the time without any complaints. A try or field goal must go between the uprights else the point(s) are no good.
There is only one exception as I recall years ago, an old field had goal posts with both NCAA and NFHS uprights. Striking the NCAA upright with the ball thus causing the kick to not pass though was considered good for obvious reasons.
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