Chassidim don’t have this problem because no chassidishe boy would demand support from a father-in-law who doesn’t have the money. It’s simply unheard of. There’s no concept of “I can only marry a girl who can offer x years of support…”
Either his father can support them, or her father can, or both sides can split the couple’s expenses, or the girl can support them (and they’ll live on a veeeery tight budget), or the guy will just have to work part/full time and learn early morning and late afternoon/nights. But I’ve never heard of a chassidishe shidduch where monetary support was a dealbreaker.