Since Jerry won't let either one of those two positions be changed I'm going to suggest plan C get a power running game like we had in 2016 along with linebackers playing the linebacker position instead of safeties and a couple monstrous defensive tackles.
even if we did get a power running game, which would require significant O line improvement, running back improvement and passing game improvement to keep an opponent honest, we will still be engaged in shootouts in order to win if we don't fix several problems on D as well. This certainly lowers the probability of wins against playoff teams.
This requires much more than just a few additions and tweaks, on both sides of the ball.
We need substantial, multi-level change on O and D. We didn't just lose to a playoff caliber team, we got killed.
They are not "close", by any measure.
Kill it now. A slow hemorrhage will just prolong the agony, and still result in death.
It's been agonizing for a while now.