SQRT, a more effective:
a pre-nuptial agreement that specifies that both chasan and kallah read books about marriage, child rearing, anger management and passed an online test and a test in person on how to change a diaper.
on your items:
– Halakha is surely against looking for mamzerim. In cases of doubt, rabbonim are going out of the way to find way to mattir. One rav told me that he came up with a list of ways to mattir in a very difficult case where there was a lot of confirmed information. When he called up a T’Ch to check and went through part of the list, the answer was “this is enough already”.
– ketubah arrangement evolved over time, see Ketubot – first it was $$$ held in the house, but then husband will be too quick to say “divorce” (like Muslims do 3 times?), hand over the money. After a couple of more options, the current one developed with a lien on husband’s property that might take a beis din to unwind. This points that changes are possible, but they should be done to balance all sides so that people continue getting married.