I think Timpo's suggestions are good. I'm curious, why is 700c so important? Why won't 27.5 do?
I think the new Vado SL would be a good choice. Despite the comments that if you turn off the motor you get unlimited range I have found the Mahle motor that Specialized uses in their SL models to be very efficient. I have a Creo and I ride with it in Eco almost all of the time. So the motor is on the entire time I'm riding and I regularly get an extrapolated range of 75+ miles. On Thursday I rode 100.5 km's or 62 miles, that included 1,000 metres of climbing and I still finished the ride with 33% battery remaining. I could have easily gone 75 miles had I continued my ride.
With a range extender you likely would get to 100 miles. Maybe the range on the Vado SL would be a bit less despite using the same motor and battery as you would be on a slightly heavier bike and a more upright position so maybe a bit less efficient. But given my experience with the Creo I think the Vado SL could meet your criteria. It all depends upon factors such as where you ride, elevation, wind, your weight, riding ability, etc …… But it might tick all the boxes for you.