"I believe that I can move the (duplicate) excess RMD withdrawal into my Traditional IRA as a rollover within 60 days."
A 60-day rollover to your own traditional IRA is possible from a traditional IRA BDA only if you are the surviving spouse of the original IRA participant from whom you inherited the IRA. If you are a non-spouse beneficiary, there is no option to roll over the funds to any retirement account and you'll need to include the extra distribution in your taxable income.
