I don't have a lot of confidence in this approach.
Why?
Because of Jarrett Stidham, Danny Etling, Jacoby Brisset, Ryan Mallet, Zac Robinson, Kevin O'Connell, Matt Cassel, Kliff Klingsbury, Rohan Davey.
9 QBs taken by the Patriots post-2nd round after they landed Brady, and not a one of them ever became a regular starter in the NFL for more than 2 years.
ZERO for 9.
I grant you there are a lot of 1st rounds busts at QB in the NFL, but you have to spin that wheel. Can't be avoided. The chances of finding a mid-round QB seem minimal at best, so much so that a 50% 1st round hit rate looks really really good.
Last 5 years, the NFL is 11 for 17 in terms of hitting on QBs in the first round, and that's with me considering Darnold and Wentz as QB busts.
Those odds are tremendous compared to what happens later.