I own a Fiido M1 Pro with the 500W motor, which is illegal in the UK and I do not wish for it to be confiscated. I have removed the thumb throttle and restricted the speed to 15.5 mph by way of pressing buttons on the display. However, my son borrows the bike to commute and he keeps changing the buttons back to achieve maximum speed. Telling him to leave the settings at 15.5 mph is a waste of time, in other words, in one ear and out the other!! Is it possible to permanently fix the speed to 15.5 mph via the display, or could I fit another universal type display that would allow a speed fix?? You are probably thinking just get a 250W bike and be done with it, however, we live at sea level and all roads out from our home involve very steep climbs. both my son and I are on the large side and I did borrow a mates 250W bike once and it proper struggled, hence the 500W Fiido. Any help / solutions would be much appreciated.