I suggest you replace the nation by either bringing back Kazakhstan to the AFC or unchecking the worldwide governing body on the lowest UEFA ranking nation i.e. San Marino. But if you brought Kazakhstan back to AFC, your nation will not enter international continental competitions like the UEFA Nations League and EURO Qualifiers. I'm messing with this a couple of days ago and I can bring my custom nation to UEFA Nations League and EURO Qualifiers by removing San Marino from both competitions registered teams (separate the editor data between your nation rules and international competition data). By doing that, your custom nation can qualify for UEFA international competition and also the club in your custom nation can join UEFA continental competitions.