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Electric brake booster, isn´t that what many modern cars with ABS-brakes have? I know some still have the vacuum servo but I think there are others that have a electric hydraulic servo together with the ABS unit.
I guess an electric vacuum pump wouldn´t need to be a very big thing, if the car have an ordinary vacuum servo.
I prefer to REMOVE things from a car to make it lighter but a vacuum tank may be a good backup and an easier alternative to electric pumps. Some time ago I had a rare russian car (a restoration object without engine), a ZAZ965 from 1967. One interesting thing about these cars was that probably all of them were equipped for disabled drivers. There was a hand-operated clutch lever and a vacuum brake servo operated from a lever at the steeringwheel. To improve safety there was a quite big vacuum tank under the backseat.
Adding such a tank should be a cheap and easy modification. A vacuum gauge at the dashboard will give an early warning for when it´s time to start the engine of safety reasons. If the one-way valve is mounted directly at the brake servo, another valve must be mounted between the vacuum tank and the intake manifold. I also guess there should be a calibrated hole/orefice so the engine doesn´t have to empy the tank too quick (risk for stalling due to lean mixture).
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