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?

I don't think there is a prebuilt Probe Basic for the Pi. You would need to build from source

we do now have rpi4 apt installation, just need to follow the installation guide for it. it is built in our buildbot.

kcjengr.github.io/probe_basic/development_quick_start_apt.html