I don't think you'll ever see this rule enforced. DD's last TB game before college was in a TCS tournament against So Cal Athletics. Umpire allowed SCA's pitcher to leave the field to go look in her bat bag for an ankle brace after the inning had already started (and they refused to stop the clock), then once she found it allowed her to put in on in the dugout, then allowed her to take practice pitches with it before resuming the inning.
Surprise - surprise - game ended with DD's team having bases loaded and 1 out (trailing by 1) because there was a drop dead after passing the "no new inning" threshold. SCA ended up winning the next game - the championship game.
Stories like this also reveal people's true motives. I'm sure if you asked this coach about why he volunteers all his time and what he loves about softball, he'd say that winning is nice but it's really about learning life's lessons through competing, developing character, making fine young ladies of all these girls, etc. But when given a choice between the opportunity to compete in a difficult situation vs. winning without competing, you see what choice was made.