FWIW; this is not a practical problem, it’s a political one. Conversion kits don’t get a pass/by from the law, they are subject to the same laws just like home brew conversions.

Fun fact: In the UK there is no ability (DVSA/DVLA[requirement to legally taxing/insuring a car]) for legally driving a converted ICE to Electric car. This is due to the MOT test having a test for CO2 and if the test returns null or “out of bounds” the car fails it’s MOT and therefore is illegal to drive.

Such a wonderful country.