Greyharp over at ODD74 has taken Len Lakofka’s Pyrologist and compiled it into a booklet along with additional Lakofka class material from Liaisons Dangereuses—the Hobbit Druid, the Hobbit/Dwarf Cleric-Fighter and the Dwarf Craftsman. The booklet is styled in the manner of the OD&D supplements.
Thanks to Greyharp for putting this together! View his discussion thread on the subject here; it includes links to various incarnations of the PDF.