You could use the 32mm MCPCB from kaidomain and cut the trace and bridge it with a cable to adapt the MCPCB to 12V.

Like so

Also there was a 32mm MCPCB from Maxtoch at banggood for a while, only could find it at mtn now Maxtoch XM / XHP50 31.5mm Copper MCPCB

(also for XHP70 Maxtoch XHP70 32mm Copper MCPCB)