Oddly enough the only new V8 ones with trip that XPart or Rimmer's appear to have available any more is YAC004300LNF, coincidentally the very one I would need (LHD, KPH, Rover), if mine ever failed. At £618 (sale price) or £996 respectively, I think I will pass on buying it for my "just-in-case" stock shelf! XPart wrongly list it as MPH (photo confirms KPH), which is probably why they haven't managed to sell it for one of the 32 cars made that would need it.
... so good to know that with a "donor" new or used unit of a different type, and a soldering iron, the correct configuration can be created.
Thanks to you, 'scoubix' and 'X13#18' for investigating and clarifying that.