So, are you proposing that FR vet the delegates?
With the elected representatives (typically 2 year terms) of the states choosing delegates, the choosers are relatively close to "the people". I'd rather have these representatives choosing delegates to make amendments, as opposed to Congresscritters making amendments. Either way, the ratification hurdle is the same.
On the 17th itself, it breaks the checks and balances of the republic. With the 3 branches being the Federal, the States, and the People, the 17th steals the State power and hands it to the People, thus obliterating one whole strap of the "checks and balances". We're in uncharted waters today... and surely "The People" need to be checked and balanced as any other entity.
You have more faith in your elected officials than I have in mine, I suppose.
I merely suggest that calling a con-con is an extremely dangerous thing to do and something that will have unforeseen consequences (which are usually bad).
These are dangerous times.
Have a good day! FRiend.