Lost Neutral on K&T Circuit
Time to rewire the circuits and rooms. You can temporarily mount new outlet boxes on the surface of the wall and run the wires on the surface using such materials as Wiremold to protect the wires (all new hot, neutral, ground).
You may never connect a receptacle or light fixture, etc. powered by one circuit to a neutral that serves a different circuit. Neutral must accompany the corresponding hot all the way back to the panel.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.