I'd suggest getting the Meguair's DACP and Swirl Free Polish or (3M SMR). The DACP is a bit stronger than the FI-2 but will break down quicker and provide (IMO) a higher final gloss with a lot less effort. Don't forget, if you go the FI-2 route, really really work the product. I couldn't believe how long it took to break it down and get a gloss out of it. On the 3M site, I seem to recall the Finesse IT material was based hard clear of days past and the new Perfect It III line was formulated for today's finishes. I had a quick go of it with Perfect III machine glaze and was pretty happy.
If I were you, and based on Klasse users, I'd layer with 3 coats of SG and stop and top of with the S100 if want to go with a carnauba topper.
Once you go with S100, you ability to apply another layer of SG is gone until you remove the S100.
After you wash, clay, polish and Protection steps. All you need to do is wash and Quick Detail after every wash and you should be good to go for about 3-4 weeks. At which point, the wax protection would have worn off significantly. You can either reapply another wax layer (S100) or simply go without as the SG will last a long long time.
I can't comment on the GEPC as I haven't used it yet. If you were to apply the GEPC before the AIO, I would think that the AIO would remove it???
As for pads, I'd suggest going with the W7000 / DACP (if the swirls are moderate to severe) or else the W8000 / DACP then W8000 Swirl Free Polish. That combo should work very nicely.
PS. I'd highly recommend a clay treatment. It's surprising how much it actually pulls form the clear and how smooth the paint feels afterwards.