How to back out of mass update in SQL Replication
There is no supported way to achieve what you want to do, aside from complete reinitialization. That said, you might be able to achieve a shortcut and retain a supported configuration, but only under direction of a Microsoft support engineer. Attempting to modify the system replication tables without that guidance risks compounding your current problems.

My advice would be to open a case under your support contract, or take the hit of reinitializing and change operating practices to prevent a recurrence of the problem in future.