Avi K-I used Gebrokst as an example. But to respond to your post, I would not advise anyone to eat gebrokst on pesach just because other Rabbonim hold its mutar if his minhag is otherwise.
Also, “very often couples combine minhagim where they are not inconsistent” is that a halachic decision???? I am not saying there is anything wrong with taking a positive minhag from your spouse. But for the husband to drop a minhag because its not his wifes minhag should need a psak from a Rav.