I'd say the goal for converting an A2 is to make good on its future-gazing conception and extend its zenith into 3 decades. There's still very little else like it, that electrification would make it seem even more current, pardon the pun.
And yet we still build one of the worst power sources to charge eco vehicles...…...Nuclear...…... whos going to clean up that mess.........oh no just bury it for thousands of years. So I don't think electric cars are the true future unless a plentiful source of "clean" energy is found.....Were just being sold a lie by those who feel they need to be seen to care about the planet.....Geneva has recently introduced pollution stickers similar to Paris and the A2 is category 3 out of 5. On days where the pollution is above certain limits, category 5 cars are banned from the city. My Triumph Spitfire isn't even classified so it also can't be driven on those days. The cynic in me predicts that once people are comfortable with this approach, more categories will be banned more often until only zero emission vehicles are allowed on the roads. At which point we will all have to retrofit electric motors if we want to continue driving our classic cars.
The only advantage of hydrogen over battery is fill time. Making hydrogen from electricity has about half the efficiency of charging a battery. Then there's the cost of compressing the hydrogen. In addition, the maximum efficiency of a hydrogen fuel cell is only about 65%.Hydrogen could be the answer. Still needs electricity to make it but you can do that when the sun is shining or it's windy. Think they are doing that on Orkney to power buses and council vehicles.