I don’t recall the name of the Rov who guided parents to assess whether the prospective mechutanim were the kind of people one might be able to handle a gett with. If yes, they could be suitable mechutanim who would get along with them.
AAQ: You listed issues that are of really dubious value as superficial matters that can be used to knock names off the list, such as nusach, politics, sports, gebrokts, etc. I hope you were injecting a drop of humor here. I need to say that because I have seen otherwise great shidduchim bypassed irresponsibly with these trivia as the breakers. Conversely, I have seen shidduchim where these factors all matched that became disastrous, ending up in bitter, highly contested divorces.