If you are going to use Klasse as a cleaner, to remove wax, then I would humbly suggest applying it twice.
First as a cleaner, to remove the wax, then again to clean/polish/seal. This extra application of Klasse may be overkill but it gives me piece of mind.
I do not personally care for the SG application but rather go straight to the wax/sealer.
I usually give my AIO a "breather" time of about 30 minutes to an hour before I apply my topper. I have noticed that if AIO gets a bit smeary this breather time will allow the excess to evaporate.
Happy Detailing,
Anthony