Sticky buttons work a treat.
Took another PHEV owner, caravan owner, for an operational run through. I had stored SAVE mode when I left home. turned OFF SAVE mode in his driveway, just single press. Turned OFF the car. He got in and powered up the PHEV again. Seat belt reminder beeps and service reminder beeps and event recorder beeps did their thing, and then my Sticky cct made its own tone and then the SAVE mode came ON automatically. He was more interested in CHARGE mode, so stored this instead. ICE came ON and before it shut down by itself, powered OFF the PHEV. Waited a few minutes and then powered ON the PHEV. Normal beeps again and then a short delay and cct made its tone and ICE started and CHARGE mode was enabled, again automatically. Pressed the save button and mode changed to SAVE on the dash. Powered OFF again. Powered back ON and PHEV resumed in the previously stored CHARGE mode, so can confirm that all features work as designed.
Comment made was "Why does the car not do this from the factory" !!
I will be adding the PCB design to any designs I have made commercially, so eventually some could become available for sale, maybe through EBay. Not sure how this would sit with the forum. These would be pre-programmed and plugable. Anyone wishing to add this type of device to their car would need to have the wiring to the car switches sorted.
Need Mitsubishi to be proactive so this device would not be needed for present and future PHEV owners. I don't really want to make this stuff. Retirement is not for mass production of ideas.