In that case, the most useful would be throwing EVERYTHING from 40kWh to older body.
PS: Ukrainians mentioned that such a little thing as foot-operated brake pedal on older body
generated a LOT of problems during retrofit.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW