This is just a suggestion and I honestly have no idea how one would go about this. And I know there would be an element of timing here with family grieving etc.
But PBRs passion (or one of his passions anyway) was porting the SBM heads, and sharing general information that you would discover in this process. I wonder would it be possible to get ahold of one of his last copies and have someone digitize it and release the tool path files. This would become the PBR port file and could be a freeware of sorts you could take to a CNC operation and have them port the heads.
It would be a way for the guys legacy to live on indefinitely.
Alternatively you could also set it up so it's a downloadable file from a website the family has control over and it's a file that you would pay for which could help defray some costs.
Just an idea. Again I have no idea and I didn't know the guy personally. About all I could do is set up a website for hosting so if be willing to help there.
Someone else would have to take this up with I'm guessing his son.
RIP
@pittsburghracer