And, I don’t know that any make-up was ever manufactured according to R’ Moshe’s psak; I’m even more doubtful today.”
So check into it further. You may be pleasantly surprised at what you find out.
I don’t think shaas had’chak is minimal Halacha. It is Halacha for a rare emergency occurrence, isn’t it, when one has no other choice?
You may eat meat under one type of very machmir hashgocha. Perhaps I eat meat under another one, more mainstream. If you were to eat the same meat as I, because there was nothing else available, you might feel that is shaas had’chak. But if that meat is meeting (pun intended) the minimal proper standards of kashrus, you may not want it for yourself, but it certainly is no shaas had’chak for most people. For me Sh”H might mean eating NON-glatt meat that I knew to be kosher because I had no food and needed protein and that was all that was available or would be available (though I would just eat whole fruit or vegetables, probably, in that case). It’s a semantic issue in many ways. Allowing a permissible form of makeup is not equivalent to eating what someone else might consider as non-kosher. I do understand your point, however.