How to drive a transistor with an active low output from a switch?
Assuming I understand your setup properly, I think you could connect each switch to the base of a PNP transistor through a series resistor.  The emitter is tied to your supply voltage and the collector is connected to ground through a pull-down resistor.  The switch common is also at ground or circuit common.

When the switch is open, the PNP transistor is off and so no power is dissipated.  When the switch is closed, the transistor saturates and pulls the collector up to almost the supply voltage, supplying the rest of your circuit if necessary or alternatively, merely providing a high for some logic or what not.