Is loud and obnoxious necessarily "cool"? Drag cars are loud, are they cool? You can spend a six-figure amount on a Porsche Macan, various Audi RS models or even an R8, they're all loud but again, are they cool?
While I'm with you on the EV for transport idea, I think for the recreational vehicle the 'right' sound is appropriate. Very occasionally, a Mk1 Lotus Cortina travels down our street. It's not loud, but geez it mights the right, gurgly Weber noises. Always brings a smile. Early air-cooled 911s aren't loud but they make the right mechanical, whirring fan noises and again, bring a smile.
This (while being loud, after all, it's a race car) makes ALL the right noises:
GT-R at Fuji
This kind of gets back to the original vs. restomod question, which as we know, is open to personal taste, but my vote for the right noises to come out of a Zed involve a modded L-series, an efficient exhaust and triple Solexes or Webers up front.
Good discussion by the way!
Jeff