If I’m understanding you correctly you would like to install Whonix-Gateway on your host to use as a Tor gateway without the use of a virtual machine? If this is the case that configuration would not provide much if any benefit over using Tor Browser Bundle by itself. The use of virtual machines on a single host is the means by which the Whonix security model “security by isolation” is achieved.
The use of Whonix with out virtual machines on a single host is:
There is an older OneVM Whonix concept that is deprecated. Developer skill would be needed to be able to safely use/configure that.
A brief overview of the different Whonix variants
Decide what virtualizer you would like to use and download the Whonix images.
Note: Virtualizer and Whonix images can be downloaded and installed on your Kali Linux host. There is no need to remove Kali Linux
Its recommended that users read the Whonix wiki to get a better understanding of security, privacy, anonymity etc.