So, what if the Watergate Break In still happens, but Nixon doesn't cover it up? Is the scandal still as damaging to him as it was OTL?
By no "coverup", do you mean that he admits authorizing the commission of a felony to assist his reelection? I would think that's a real deal breaker with a giant segment of the electorate, maybe not today, but then...
If he preempts the judicial investigations & Congressional scrutiny with a honest and open house cleaning it will go a long way to saving his ass. If he takes responsibility for his part in it, not throwing the 'Plumbers' to the wolves then he gains even more traction. The right and a fair portion of the independent voters will not accept the disruption of a witch hunt or a justifiable impeachment proceeding against him. "My further service as President is up to the American People. I will accept their judgement as expressed through the mechanism of the Constitution. I will serve as that judgement dictates, to the end of my term or a lesser time... yadda yadda ... "
Nixon is fine if he throws everyone under the bus and disavows them.