Doubt it tbh. Toriyama actually even had no intentions of Vejito coming back. He said it was Toyotaro's (Guy who does the manga) idea to bring him back. Fan service and shit, which is probably why the fusion didn't last long enough for him to do anything worth a fuck.
Compounding w/ the fact that a fused character has never won anything (either fusion ends or w/e; minus movie 12, which isn't canon; nor written by Toriyama) and I'm not expecting Vejito and even if so, he's not gonna accomplish anything.