I can tell you from personal experience that FOG and Kace can coexist. Look into the ITNinja forums for setting the 244 option for DHCP for the K2000 and leave DHCP option 66 for FOG. Then look into PXE chaining to the IP address of the K2000 if you still want to use it for imaging. The K1000 and K2000 are completely separate so you shouldn’t have to worry about the ticketing/inventory system at all.
Our FOG installation works similarly to the K2000 Dell drivers feed where it uses DPInst to install hardware-specific drivers after sysprep based on Dell model number. (You may also need to rebuild your KBE ISO to tell it to use option 244.)