Hi Michael,
you are correct about the injector pump (externally). Don't know about internally ( don't want to mess up another one )
I assume what you mean by stopping it in gear is - if the engine races, put on handbrake, out her into 5th and, while pressing on the brake pedal let out the clutch ( to stall the engine). Correct?

Hopefully, it won't come to that!!
Away from the car for a few days. Will let you know if its purring or screaming later

cheers
A