Just to note, R’ Moshe’s letter where he said cholov stam is only b’shas hadchak was written to a yeshiva which always used cholov yisrael, and was thinking of switching. It doesn’t apply to the general public, as it was a specific case. In R’ Moshe’s teshuva to the general question of cholov stam, he made no mention of shas hadchak.
Additionally, most kashrus organizations have no problem giving a hechsher to dairy which isn’t cholov yisrael. R’ Belsky is a posek for the kashrus division of the OU. Do you think for one second that if he held it was a problem he’d allow a hechsher to be put on cholov stam items? Obviously, it’s not an issue, and believe me, R’ Belsky knows way more about this than you do.