For mine, I am now letting sleeping dogs lie but if or when the pcb fails, think it could all be sorted over a weekend. It’s not as if any pcb failure is going to leave me immobile as it’s just ancillary functions that you can live without… until MOT time.
Good plan and ready to spring into action
The indicators conking out was always my concern. The ‘flash’ looks to be dependent on the micro, crazy….
That might be a bit of a nuisance when the electronics or micro does eventually die, or gets taken out by a spike from the blower motor

At that point its either a new PCB or a complete re-wire.