I agree with what you're saying. An interior Olineman should fire out...like a quick half step...while double fist/palm punching his defender in the chest, thus standing him up while stunting his ability to gain leverage against you the way Connor Williams did on the video initially used in the opening post where it was a run play, Connor fired out, quickly stopped Aaron's momentum, stood him up while not giving up any ground and was able to control him. That's what Connor and any interior Olinemen should do even during pass protection plays. (See video below) A quick half step fire out, open palms, jabs to his opponent's chest/shoulders to stop him cold right off the snap of the ball. The Olineman should have the advantage since the Olineman knows when the ball is actually going to get hiked.
As an interior Olineman (Center or Guards), if you stand straight up and automatically start backpeddaling like outside O-Tackles do during pass protection, FORGET IT! You already lost the battle!!! Like you mentioned, you will be 5+ yards in the backfield at the snap of the ball with a defender bullrushing up against you, leaving your QB no room for protection or no pocket to step up into and deliver the pass. (See video below)