there are 'clauses' that allows a muslim not to marry due to economic reasons,
Depend on what you mean with economic reason. Men should have a job if they want to get married, but low income actually is not a barrier to get married.
Some husbands who I know personally were poor and had low income when they got married. I still remember their life, they lived in a room in the parent house, or rent a room (or 'mini' house). Then when the husband income gone better they rent a house. Now they are wealthier, or even rich, can buy house, car, etc.
I found two similarities among those success husbands
First: They have good motivation to build the better future for their families, and they work hard for this.
Second: They have wives who never complain on the husband's income. Those wives always grateful with what their husbands have given, and they always support their husbands.
Marriage is team work which the husband and wife struggle together to build the better future, with their own roles. Fulfill the family need is the husband duty. The husband should work hard as best as he can. The wife should understand it. If the husband has low income, the wife should not complain, but should make du'a and always support the husband.
The unmarried brothers must have a job if they want to get married. But they do not need to wait to become rich. What the brothers should do is find and marry
salehah women which can be grateful for the sustenance given by their husbands, and always appreciate the husband struggle in meeting the needs of families. In Shaa Allah, easiness will come to them.