krfb is then what you are looking for.
Make sure you understand that KaOS is not Arch linux, or based on it, so instructions for Arch do not just apply in all cases.
https://kaosx.us/about/based/
it doesn't work, it doesn't start, there is an error with PAM
For help with errors, you will need to post full output, no-one can guess what you see.
How to get a full desktop in the 21st century KaOS
No idea what this has to do with remote access, but it seems you already decided KaOS is not for you. And that is not unexpected, limited repo's with just around 2200 packages & one DE is not for everyone, certainly not hidden on the website.