Bull6791- Sorry about muddying the waters by mentioning that Einman Fabrik Clear Pearl. I sent some to Tyler (was it really *THAT* long ago?!? Oh man...) and couldn't help but mention it. Eh, never mind....
I've never tried the Collinite 520, just used their 845 and 476S. Those were among my faves for a long time and yeah, they're OK...I'm not throwing them away even though I'll probably never use them again. FWIW, the 476S lasts longer and has more "depth and jetting" (scare-quotes because we're splitting hairs) whereas the 845 can be used on trim (if you do it right- don't let it flash/dry, buff off immediately) and has a "brighter, glossier" look (ditto on scare-quotes).
I'd bet anything that the various Collinite products are compatible. They make good stuff. I'd be literally 100% confident that you can use the Meguiar's UQW on Collinite waxes (and I'm about 80% certain you could use it over top of *anything* that's not a coating).
Some Polish that finishes out ready-to-wax, then one of the Collinites, maintained with some SprayWax or a Leaves-Stuff-Behind Quick Detailer, would certainly work well. BUT...
Still...when I think about your specific situation, and the concerns you've raised, and [every other factor that comes to mind], this time I come back to using that Griot's Ceramic combo. For your first go-around with a polisher, that Ceramic All-in-One strikes me as a complete no-brainer.
With all the [stuff] I have on the shelf, for my next Big Detail I'll either do something more involved (regulars here know that would involve FK1000P), which I'd rather not steer you towards, or else I'll use the Griot's Ceramic. And I'm *extremely* particular about what I use on my vehicles
