help with millrun and/or custom Z-X-A(or C) lathe/machine

Hello everyone, hoping someone in the community can help. I have a lathe that I modified to have the headstock be driven by a positional stepper motor, and have added a spindle on the cross slide WITHOUT a Y axis. Thus, I am looking for help getting a working processor that can generate gcode for 2d milling in this configuration, meaning I can do things like drill holes on the face of my stock off center. 

What is the best way to go about doing this? Has anyone already made or used a working post processor for this? An old thread in fusion360 support said to find a post processor for millturn and remove mention of the Y axis so it only generates gcode without it - is that the right way to go about it?


Lastly, can someone verify if my kinematics are organized correctly in fusion360? My rotational/positional axis is along the Z axis and holds the stock, my spindle is on the cross slide (X axis) and points along the Z axis (attached image)

 

edit: just to share a bit of my progress: I found an old fusion support thread that suggested to use the doosan millturn fusion360 post processor and set "gotyaxis" to false everywhere. When I do that, and generate Gcode, it successfully does not include Y axis movements, however, I believe other changes are needed to align the gcode output to be compatible with linuxcnc and am struggling on where to start.I will attach this modified post processor, and attach a simple off center drilling gcode that I generated using it: 


 

 

Please help - I am completely lost and have hit dead ends with the doosan post - I am now thinking it is better to start with the linuxcnc milling post or find a different post.

Do you think I should look for a post processor that handles 4th axis milling and limit Y axis output?

I think I know what the solution is but I just cant seem to get it to work. Fusion360 has a post processor training guide and in it they discuss a section called polar interpolation, which is exactly what I need, it replaces one of the linear axis with a rotary axis and outputs strictly polar coordinates. If I go to prebuilt millturn posts such as haas 35st, doosan millturn, etc - and use that post to process my machine kinematics and toolpaths - it does output seemingly correct polar gcode. However, their post processors are significantly more complicated and have a variety of gcodes that are not relevant to linuxcnc. HOWEVER, when I try to manually integrate polar interpolation to the linuxcnc milling post, I am unable to get it to work, it still always outputs cartesian coordinates and or says the direction of my milling is incorrect.