You might like to try a gravel e-bike with perhaps a
suspension stem to take the edge off the bumps.
The
Kona Rove HD has a hub motor and torque sensor for a reasonable price (
review) and is relatively light (<45lb) for an e-bike, or if you need more power for steeper hill climbing you might like to test ride one of their mid-drive models such as the Kona Dew-E (
review)