Yep, mine is one of them Of the others, the two Brits sold up a while ago and the other chap is in Sao Paulo. Mine is the one running a non-standard Fardriver 72360 controller and display. I did ask about battery rebuilding there too, but no replies were forthcoming, sadly.
The underseat compartment holds two of those big green battery packs in the OP rather neatly side by side, which is why I want those rebuilt to 72V rather than trying to fit something else in there that won't use the space as well. I'd rather avoid Aliexpress batteries because, although they're cheap, you don't know what cells are in them.