If you are worried about losing brake vacuum after several applications of the brakes during EOC, there are several options. You can add a vacuum tank (easily made from sections of PVC pipe) to your vacuum system for additional vacuum storage, install a 12V vacuum pump (either buy new or get one used from a junked diesel car), or, with a manual, simply pop the clutch to spin the motor for a second or two, then shut it down again once it has regenerated the vacuum. The motor just needs to spin in order to generate vacuum, it doesn't matter if the ignition is on or off.
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