frumguy
If every single day I had a minimum of 3 standing appointments during which I recited the same exact predetermined text in front of the king/judge, then yes after a while (5 years? 10? 20?) I would start mumbling ina way that didnt SOUND like I was having kavana
note: I am not saying this is right just answering your question:
“Would they use this tactic standing in front of a human king or judge (lehavdil)?”
without a doubt yes!