I had several long conversations with Zero and Brammo about participating in our documentary. Ironically, the then marketing director of Zero held the similar position with KTM when he told Ewen McGregor that KTM was pulling sponsorship for Long Way Round...a decision that cost KTM multiple millions of dollars and put BMW at the top of the ADV world. The decision cost him his job at KTM.
Zero said they'd love to participate, but in real life and road conditions, the best their bikes could do were maybe 60 miles and then needed 8 hours to charge. So basically 50-60% of what they claim on the older battery (standard) packs. He did, however, offer participation in a subsequent planned project that only requires maybe 50 miles per day with extended overnight stays where a Quick Charger could be properly installed.
I would project the same is true for the larger battery packs: discount range claims by a considerable margin.
The charge times quoted are using their "Quick Charge" tech, like other electric cars. Problem is the Quick Charge stations are few and far between, and still require 2-3 hours to charge. In our case we talked about mounting Quick Charge stations on a mobile platform powered by a large diesel generator, and he claimed it would still take 4-6 hours for full charges. We talked about spare batteries being charged then swapped on the road, but it gets expensive and complicated.
I am sceptical of range and charge times manufacturer claims in real-world usage.
I have two good friends who are prominent moto-journalists, and both have reviewed electric motorcycles. They state while fun and intriguing, with amazing "right now" full torque, the weight distribution, balance, CG and suspension geometry make them not handle like a "regular" motorcycle and they never felt fully planted in conditions other than a straight line. There are, however, some purpose-built electric motorcycle racers. The Isle of Man TT has an electric motorcycle class.
Zeros are fun bikes, but they're not for your application. At this stage, they're basically super-scooters, best for (electric) puttering around town, but definitely not for running La Cumbre.