“some people keep chalav Yisroel l’chumra, not as a halachah. So, they would be fine with giving chalav stam to other or eating off of chalav stam equipment.”
That’s true. As you know, Rav Moshe, who’se motter CS says a Baal Nefesh should be machmir. So such a Baal Nefesh could give CS to a non-Baal Nefesh.
But my earlier comments regarding it being prohibited for a strictly CY consumer to give CS food to a CS consumer was referring to those who hold by CY (and not CS) Al Pi Halacha, Al Pi the shittos (held by virtually all Chasidic poskim and many others) that CS is Cholov Akum mamish.