Always_Ask_Questions,
“how many times I need to clarify my question: which acharonim allow using non-Jewish support system for poor people in order to learn – and not just for one person but for whole groups.”
You keep moving the goalposts. You spent much of this thread decrying learners taking benefits they are entitled to by law by erroneously calling it tzedaka in order to bring in your Rambam. And when AviraDeArah blows this out of the water and shows that later poskim permit even taking mamash tzedaka for learning, you suddenly become a convert to the benefits are not tzedaka cause, and create a new category called “non-Jewish support system for poor people” and demand we bring sources to support THAT! This is rather disingenuous.