Please use this solution as opposed to the initial one I posted which postulated that this could be solved if it were possible to "remove" the previously filed return so that the corrected return with the same ssn can be efiled.

Bethany of Intuit efiling support walked me through the simplest yet elegant work around. Simply open the original efiled return and change one digit of the ssn (I changed the last digit). Also uncheck "Electronic Filing" from the federal information worksheet of that return. Worked like a charm!! 

Apparently since there's no longer an identical ssn to the "corrected" return, one will not get the efiling error notice of the same ssn having been efiled earlier.

Much kudos to Bethany!