RNC wouldn’t have standing until after it’s too late, if I’m understanding correctly.
I think the only one who can do it is Trump. He needs to do it.
RNC has more standing than Trump. They are the once who have to certify the candidates as eligible. They are the ones penalized if the court later determines ineligibility. Trump is only damaged if he looses to Cruz. Or if he chooses he or Rubio as VP and then he and the RNC would be charged for filing fraudulent eligibility papers.