Steering Column Woes and Questions - Connector, Lower Bearing, and Coupler

Have you tried a pickle fork / ball joint splitter behind that box coupling ? Even hitting it toward further on the shaft can help. The slightest movement in any direction will break up the seize and create veins for your penetrant to flow through.
As for that connector, a crack and/or broken lock/keeper aint such a big deal. I cant believe it would fall apart. Good terminal to terminal contact is all we need. You can throw a zip tie around it or throw the 12 bucks at a new one.