Lightbrite – that is so nice of you to think of me! Thanks so much!
By the way, I just read an article about a certain well-known Gadol or Rav (it might have been Rav Shimshon Pincus) written by a relative of his. One of the stories was about how he gave a relative of his a ride to a chalav-stam ice cream place, even though he himself wouldn’t eat there.
To answer your question, the general rule in such matters is that if you consider the Rabbanim who permit the thing in question to be reliable Rabbanim and the opinion to be a valid opinion, then I think it’s okay (for example, my friends don’t mind if I open their soda bottles on Shabbos, especially if I’m doing it for myself.)
You should probably ask a sheilah though because it may depend on various factors.
But if you don’t think those Rabbanim are reliable Rabbanim or if you hold that something is absolutely assur, then it would be a different story.
When it comes to Chalav Yisrael, a factor to consider may be if you are makpid on it because you are holding by a shita that says that chalav stam is absolutely assur vs. if you are following a shita that chalav stam is muttar but a kula.
My impression is that Chabad may hold that it’s absolutely assur, so if you consider yourself to be Chabad, you should probably ask your Rav, because that may make a difference.