According to every single peer-reviewed legal report conducted on the Article V Convention process, a convention can be limited to a single topic (in our case ensuring Free and Fair Elections) and that there are mechanisms in place for those limitations to be enforced.
Although you can find opinion editorials that spread the unfounded fear of a "runaway convention," these peer-reviewed legal reports are conclusive. Click here for the official count of Article V Convention applications from Congress.
Here are some excerpts. The complete reports are linked below.
“This paper concludes that Article V permits the states to apply for, and the Congress to call, a constitutional convention for limited purposes, and that a variety of practical means to enforce such limitations are available.” - Limited Constitutional Conventions under Article V of the United States Constitution, Office of Legal Policy, U.S. Department of Justice
“The framers did not provide an unchecked grant of power to a convention: every amendment proposed would be subject to the same conditions faced by those proposed by Congress... the notion of a ‘runaway’ convention, succeeding in amending the Constitution in a manner opposed by the American people, is not merely remote, it is impossible.” - Report to the 98th Congress, U.S. Senate Judiciary Committee, 1984
“...The Convention Clause provides an important means to adopt or force Congress to adopt amendments that are perceived to be in the national interest by significant percentages of the American population, but that are detrimental to the interests of members of Congress.” - The Other Way to Amend the Constitution: The Article V Constitutional Convention Amendment Process, Harvard Journal of Law & Public Policy, Vol. 30, Issue 3