Your talkin' 52 miles per day. That's quite a bit. I'd like to think a Dutch style commuter with a Gates Carbon drive and Nuvinci N380 hub would be ideal. The maintenance aspect of chains and gears killing cost on any bike including your current e-cargo bike is the deciding factor. I'm pretty sure a battery at both ends would be preferable because the depth of discharge is also a factor of battery life.
Back when I commuted that distance, I did it on an analog bike. I'd ride in in the mornings, the bus home in the afternoons. The afternoon bit actually was time equivalent to aa car because the roads were clogged with other cars. I still managed only 4 days/week with this arrangement.
Your cargo bike will not be welcome on a bus. Hence my thoughts leaning towards a an appropriately equipped (Gates/Nuvinci) Gazelle C10 with additional battery for peace of mind.