57_300SL - The Meg's #7 is simply incompatible with the Klasse twins. If you want to use #7, don't use Klasse. If you want to use Klasse, don't use #7.
They are two different approaches. The #7 will deposit oils on the finish, making it look good. It will also fill the "micro fissures" in the paint with its fillers, which adds to the good looks. You would then seal these oils and fillers in by applying something like a carnauba wax. Gotta use something that will work over the #7, and many products won't (carnaubas are the "safe" approach that *will* work well).
The Klasse twins work differently. The AIO will clean the paint (removing anything like #7 that's on the paint) and the SG will seal it, bonding to the AIO. The SG would *not* bond to the oily #7. Putting #7 over the SG wouldn't be a good idea either as a) the #7 would probably just smear, not bonding to the SG and b) the solvents/oils in the #7 could compromise the SG.
Note that the stuff in the Klasse twins won't do the same "concealing" of imperfections that products such as #7 can do. I don't use Klasse unless I'm working on a car with a basically flawless finish. On an imperfect finish, I'd rather use fillers/glazes/wax. The Griot's #3->#7->carnauba approach would work well for a showcar. Some people would simply apply the #7 regularly, skipping the wax altogether, but I'd apply the wax. Actually, for your Glasurit, I'd use either Meg's #5 or their #81, or #3 instead of the #7. I prefer to use #7 on single-stage, where it can better soak in. For basecoat/clear paint I like the others, which "dry" more completely and might even adhere to the b/c paint better.
ktlimq- The above also applies to your ideas about Meg's "pure polishes" in general (#3/#5/#7/#81). About the only "cleaner wax" I can think of that won't simply remove these pure polishes is Meg's NXT. And I don't know that from first hand experience, I'm just going by what Mike Phillips has said. Generally, whenever I follow a Meg's "trade secret oils" product with anything that cleans, it strips the Meg's stuff right off, making it a wasted step (and making a lot of fine marring "come back").
Oh, and the "nourishes paint" thing works a *LOT* better with older technology paints than it does with today's basecoat/clear paints. Today's paints don't absorb oils/etc. the way older paint did. "Old-school" lacquer would absorb #7 like a sponge, but #7 basically just sits on top of today's paint. Today's clear doesn't so much need "nourishment", rather it needs *protection*.