I’ve always had an issue with women working in order to support their husbands in learning. Women ideally aren’t supposed to work. They’re supposed to be full time mothers. Kol kevudah bas melech penimah- tznius seems to say that a woman should be living her life in private, not in public. Now, if a woman decides to work because of her menuchas hanefesh (she can’t be in the house all day) or because her husband’s salary isn’t enough to provide for the family, that’s one thing. There is no issur for a woman to work, it’s just a hashkafic issue. I don’t think this hashkafic issue is a reason for a woman to live with less menuchas hanefesh or in poverty (assuming no actual halachos are broken).
Working to support a husband in learning is different though. Talmud Torah is not just an ends in and of itself, it’s also a means to an end. The end being living a life of more Avodas Hashem. Talmud Torah is supposed to make us (and our families) better ovdei Hashem. It doesn’t seem like we’re suppose to make concessions in our Avodas Hashem, and our (or our wife’s) tznius in order to learn Torah. That seems to be backwards. Talmud Torah is supposed to lead to a life of greater tznius, not the other way around.