I'm not espousing a wholesale tampering. Nor am I espousing crafting a new constitution.
A Convention for Proposing Amendments is merely a way for the states to gather in convention and propose an amendment on a subject predefined in their petitioning language. There would only be wholesale tampering if two-thirds of the states requested a general revision of the Constitution in which any amendment on any subject could be introduced. No one has seriously suggested that in over 200 years.
However, any day that Congress is in session, it can propose any amendment on any topic, to include so many amendments that it would constitute a general revision of the Constitution. Note that something like that hasn't happened since the 13th, 14th and 15th Amendments were introduced in the days immediately following the Civil War.
If you're in fear of a "runaway" convention, Congress has created safeguards to prevent that.
While legislators are a group of spoiled functionaries, who knows what delegates would look like?
I guess I see the distiction you are trying to make, but seeing the lid lifted on the box that contains the Rule of the Proletariate makes me shudder with the first creak of the hinges.
You are saying that delegates are no more dangerous than Congressmen. That is perhaps true in general but the left is more vigilent in seizing opportunities to seize power than the right is in simply hoping it power can be kept caged up.