@Greg-Plamondon From what I read you can’t really install the kiosk client. Maybe I missed that part. But the FAQ states that you can customize the ISO file.
For PXE booting, have you tried memdisk iso booting yet? Thou this is legacy BIOS mode only:
chain memdisk iso raw
boot || goto MENU
Edit: Quickly extracted the ISO and found this in
append initrd=initrd.xz,pxelinux.cfg/initrdpxe.xz quiet http_server=
So you might be able to boot the extracted ISO. But on the other hand we don’t know too much about the kernel parameters for network booting this beside the litte information on their website: https://porteus-kiosk.org/pxe-server.html
Be aware that FOG is not using pxelinux anymore. We use iPXE now and while you can do many more things with iPXE it’s not always possible to translate things over from the old pxelinux.