A: Isn't the only "video mirror port" available for the 575 a rare third-party device that hackishly pressed on top of the video chip?

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AFAIR, and I was checking one out on ebay recently, it's an Apple part (of that I'm pretty certain) though there may have been third parties as well, and there's a slot set aside for it (not 100% certain).

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The only reference to an output port I could find for the 575 was for a device called the "Presenter 575" that some sites say was a product of a company called "Power R" while other sites call it an Apple product. They're probably the same thing. In either case they seem to have been a *very* niche product aimed at hooking the Mac up to a projector or other large screen.