Being a regular used of Klasse AIO, I think it would probably remove the Meg's #16 wax, but the Zaino may require a different approach.
Not being a Zaino user, I don't know what is needed, but when I start over on my van that has UPP sealant on it, I just use Meg's #9 for swirls, Klasse AIO for cleaning/prep, and apply the UPP.
It seems like I remember some comments about using an alcohol and water solution for Zaino removal.
Charles