“I personally do not eat cholov stam -“
Neither do those who rely on the psak of Rav Moshe z’l. they drink/eat what he called “chalav shel hacompanies”. He paskened that the government oversight and controls satisfied the requirement of chazal as it relates to chalav yisroel. I never asked, bu tI suspect Rav Moshe would never permit anyone to show up at a non jewish owned farm that is not under government regulation and oversight (IE, it is not a commercial establishment) and drink the milk offered by the farmer.
At any rate, as it relates to the question of lifnei iver, has anyone asked a Rav?