Making a simulator version of my router table config?

Hi there. I've used 2.9.x successfully on my a gantry-style router I built, and it works pretty well. Now I'm working on some UI and feature enhancements to it, and I'd like to be able to do this on my Mac and without the machine. So I installed a Debian 11 VM, checked out the code, built it, and after a few hiccups (missing OpenGL, not knowing where the built binaries are for run-in-place), It'm able to display the Axis UI for a simulated machine on my Mac. So far, so good.

Now I'd like to make a simulated version of my router table. Is there any guidance on how to accomplish this? My router table uses a Mesa 7i76e, and has a tool changer, tool presence sensors in the spindle, tool setter, an air pressure sensor, as well as controllable fans and z-axis brake. Is it possible to write components to simulate the presence of some of these things? I really just need for my VCP widgets to be able to access some of the state variables, and it would be amazing if I could get my tool changing/measuring to work. Doesn't have to be super accurate, just has to let the python and ngc routines I invoke think they're working.

If I can't do all that, what's the best way to get as far as possible? Just try launching my .ini and go from there?

For reference, this is my .ini: github.com/JetForMe/router-table/blob/ma.../router3/router3.ini

If you can live with using stepconf, it can make a simulated config.
Won't be able to test mesa stuff but maybe that doesn't matter.

I am on a similar quest with a gantry CNC router table. I copied one of the sims from source and modified it, but immediately get a joint 2 following error (the second motor on the y-axis gantry) upon homing or jogging the joint. Looking at Halshow, it seems joint.2.motor-pos-cmd is set to a non-zero value momentarily and immediately throws the following error. I'm happy to share my ini and hal, but I'm hoping someone can tell me where to start troubleshooting.

Thanks.

[EDIT] Never mind - figured it out; neglected to wire up motion enabled to joint2 mux select...