My understanding is that the Fulltone OctaFuzz is a direct clone of the Tychobrahe Octavia, and the Tychobrahe is of Mayer Octavia lineage.
And the name of this PedalPCB pcb is suggests that it may scratch that itch:
Compare to Roger Mayer Octavia
www.pedalpcb.com
Just guessing, would be interested to learn more.