Normally, I would agree with you. I am very familiar with cutting traces and stuff (built several ground-planed spiderweb transmitters and so on). Problem is, that this design is already completed, several PCB's have been made, and I wouldn't like to rework them all with cutting traces and stuff. Feeding the buzzer with 5V gives me too much sound-loss.
I know I am starting to be a pain in the ass, but the solution like in my opening post would suit me best. I think I am going to sacrifice a PIC, and just see what happens. The 7.2V voltage probably wont't be the problem, the only thing I am afraid of, is that the PIC might not like the 7.2V being present when the Vdd-voltage regulator is switched off. I'll just see what happens, if it fries my PIC, I probably cannot bypass the extra FET-idea...
edit: unfortunately 5V buzzers are too "quiet". I ordered like 7 or 8 different types, but I didn't like any of them...
...my demands are just way too high...
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