Confused about how to set up Probe Basic on a Raspberry Pi

I have a working configuration with LinuxCNC using AXIS and would like to try switching to Probe Basic.  I've gone thru the Pncconf trying to create a Probe Basic configuration and it seems to require configuration of Mesa cards which I don't have.  I'm using direct GPIO into a Rpi hat, which isn't directly supported from the standard stepconf tool either, but I was hoping to do what I did with stepconf -- make a config that assumes normal Linux parallel port configuration, and then modify that to use the Rpi GPIO HAL.

I saw a reference to a Probe Basic sim configuration in another thread with the suggestion that someone with a working normal stepconf config could look at the Probe Basic sim config and see what modifications need to be made.  But I can't find that sim config.

Could someone point me in the right direction?