My best work around is to tag an arduino pro mini and use the third fan pin to check the fan speed and then relay that as a filament runout error to the Z-max pin. If the pro mini arduino code works, I can copy and paste it into the config or main page and pray that it compiles and runs?
Since I am in the realm of fantasy, if I can find the filament runout code then I can copy and edit it to a different pin than the runout pin and designate it to say whatever fan that is connected is dead?