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Yes.You mean the Q1/Q2 pair?
Could you explain why increase power here?Almost certainly to increase power, to isolate the oscillator section from charge pumping / regulation circuitry behind it. If it happens to invert or not wouldn't make any difference to function here.
Why? You only need one output that lets current flow into or out of the diode section (through C7). If that generates the desired voltage, job done. The other 'output' you are suggesting, consists of the "GND" supply line here.From the circuit above why don't we take the differential voltage from two branches of oscillator into the charge pump?