Converting a working mill configuration to an equivalent sim

Now that I've tightened up my estop game, I can no longer simply turn off my stepper drivers in order to run simulations on my mill software, since doing so makes everything else think there's a fault.  I knew this would happen, but I promised myself I'd figure out how to use a sim instead.

What's the easiest way to copy a mill configuration, and turn the hardware-aware parts into a simulation?  I'd like to preserve as much of my UI (including pyvcp panel) as possible, even if much is non-functional.

(If that's hard, I'll settle for a recommendation on the most functional x/y/z sim to use, instead.)

I don't want to start disconnecting hardware for this. It's really just to see, while I'm sitting in my living room, whether the g-code is "mill ready".

In the end, I just took a copy of /usr/share/doc/linuxcnc/examples/sample-configs/sim/axis/axis.ini , and I'm using that. I have a pretty basic mill. I had to adjust the limits in the .ini file, and I realized that since I'm simularing I could bump the velocities way up, and it's been useful, so far.

What kinds of things are you worrying about, that will "wreak havoc"?