If he is willing to accept a salary that is not too big then there is a possibility that a European team will sign him, but if he asks for a high fee it will certainly be quite difficult for a team in Europe to re-sign him. Several teams that will compete in the Club World Cup have a short-term interest in signing Ronaldo such as PSG and Real Madrid,
Signing ronaldo wouldn't have a huge advantage for the playing pattern. But I think the team will think in terms of business. If the team's target is to lift the team's performance I think it's not a good move. I think it is better to sign a player with potential at the same price than Ronaldo. His age and ball control are far away for European competition I don't think he can compete to play fast and high tempo.
I've read in research articles that Ronaldo's body is younger than his age. But I don't think that's true, we've seen how his speed, technique, and ball control have been much different. He's not as good as he was at his age in the study.