With the Maxi-Cosi/Cybex car seat adapters, you can also fit a Joie 0+ car seat, yes.
The Kinderkraft-issued cheaper car seat issued in a 3in1 combination with this stroller at times doesn't offer any Isofix base compatibility, I am sorry to say. It is a cheaper alternative that can only be belted in the car with the safety belt, no base.
Other car seats fitting these adapters:
E.g. Some Maxi-Cosi (Cybex, too) car seats offer a belted base possibility, I believe - ie. the Easyfix base for the Cabriofix car seat.