Welcome to AGO! As for AUdi clears, I've been reading that they're hard...but someone can chime in for that because I have no experience with polishing, except for maybe like a few minutes in my whole life time with the UDM. If it was me, I would get XMT 1-3. There's XMT kits on AG

They're really well priced and you save money! If you don't want to add swirl marks with Klasse AIO, just use a finessing or finishing pad, they don't have any cut at all. I have no Klasse experience, but I know for sure finessing and finishing pad have no cut so those are safe.