Which filler / primer is suitable for lime-gypsum light plaster?

Hello,
our house is plastered inside with a finishing coat in Q2. A lime-gypsum lightweight plaster (Multigips 103L) was used for this.
Hopefully, in 2 months we will start with the painting work. Which filler should we use for that?
An acquaintance suggested "Knauf Uniflott". Is that okay? Or should we stick to a product from Multigips?

Actually, we wanted to apply and paint painter's fleece, but now the painter's fleece will be omitted.
We will also preferably only fill, prime, and then paint the "worst" spots.

Which filler and primer are recommended? We would like to use the same filler for all walls. Is that possible?

Exterior walls: aerated concrete (+[WDVS])
Interior walls: sand-lime brick
Ground floor ceiling: concrete / filigree ceiling (only joints were closed)
Bathroom extension: gypsum board
Upper floor ceiling, roof slope, and knee wall: gypsum board

Thank you very much for your advice.
Best regards, Simon

I think you are making it too complicated, but I was like that in the beginning too.

With Knauf Uniflott Finish, you certainly can’t go wrong for all your wall types.
If you use other fillers, nothing will happen either. Over time, you’ll use a few bags or buckets anyway. And whether you can always get just that one type, I don’t know.