Don't want to spoil any business here, but you can get the required parts in any electronics shop for <2 €.
The diode can replace R803 on the A2000, then solder the socket directly to the board. (You can do this on other models as well, just can't recall the locations off the top of my head - though it's easily figured out by looking at the motherboard.)
And Zac67 is right, make sure to use a germanium diode, there will be less voltage drop than with silicon diodes.
Not to detract from DJBase's nice solution.
