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If it really is cheaper and you have the space it can be better to have a charger for each 12v battery or each pair of 6v batteries because it will then charge it until it is full instead of over charging the whole pack because of one bad battery.
But if you want to go the cheap route, there are golf cart and electric fork lift battery chargers that charge at 36v or 48v and tend to cost less, but then again it's hard to say what you can find where you are.
What is a central locking vacuum pump? you can hook a vacuum gauge up to your gas car's brake booster and see what kind of vacuum it is getting, it's not a perfect true vacuum of course so what you are talking about will most likely work, then you just need a vacuum bottle to store the vacuum so the pump is not running all the time and so you can use the brakes a few times without running out of braking power.
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