Hi guys concerning appimages and flatpaks, one program that helps install appimages, and flatpaks in kaos, is the program Bauh, which also can keeps your flatpak apps updated even I believe certain appimages.

Appimages are not the chosen bundled application option for KaOS, that is Flatpak only. The GUI for Flatpak is Discover.
Any packages you want to have on your install for others (snap, appimages), you will have to build & maintain yourself:
https://kaosx.us/docs/package/

Yes snaps are not supported but concerning appimages, you just execute them and they work that is what I did, I downloaded bauh, in appimage format, executed it and it worked and through bauh , bauh was able to install bauh in the apps of the app menu, and through bauh which is gui , you can install appimages and search for appimages and install flatpaks and update them.