Do any of these systems have a simple relief valve keyed to case pressure?
Normal op: pump runs under load, pumps case down below ATM.
Trigger event: case vacuum reaches pre-set limit, Hobbes NC switch (sender can be anywhere if ported to case - valve cover, pan etc.).
Alt op: switch opens solenoid "T"d into the suction line from the case to the pump inlet, which admits (filtered) external air. The pump uses less power since it's not drawing against a vacuum, and the case pressure rises (due to blow-by, thermal load) until the switch closes when the trigger event is reversed. If air went right to the case the pump load would never drop.
Revert to normal: solenoid closes, shuts off bypass air, pump is now loaded to case vacuum. Fastest response: big connecting hoses, switch close to pan.
If you had a data logger with an unused channel you could plot solenoid cycling against RPM and MPH, but even an indicator light would tell you if the pump is too big, running too fast etc. (light is on too much).
Not only would this prevent losing bits due to lube failure and get back a tiny bit of power from the pump drive, but potentially tune in your pump speed (or capacity) without fraying your nerves. Even using quality parts I'll bet it could be done for $50.