So, we can assume that crystal is the timebase for 16" at 75 Hz refresh... in order to underclock for 60 Hz refresh, you want a crystal 0.8 times (60/75) the frequency -- something like 11.45 MHz, a bit higher or lower won't harm, just check what's available.

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Cool! I just found your post now and this is definitely worth a try! Thanks for the suggestion.

I'd like to see a 960x600 60Hz resolution. Exactly 1:2 pixel ratio of my 1920x1200 display.

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That's not gonna happen, what you'll get will be 832 x 624 x 8bit x 60Hz LetterBoxed within frame or interpolated to full height and letterboxed on the ends on most LCDs that are Mac fixed res/frequency hostile.