Sidecars aren't great, they are tricky and have a high learning curve. Cargo bikes or trikes might be better, or an e-pedi cab with throttle, however these options will either fall short of your range requirements or require extra batteries (swapped in or wired in) and more likely than not would require you to be able to rest your feet on the pedals so that might not be ideal for your situation.
I'd recommend maybe taking a look at ICE scooters/mopeds to get the range you're after for less money or maybe mini-vehicles (Smartcar, Kei trucks, etc.). There are EV offerings out there that could work too, but they'll be pricier.
I'm going to go ahead an pin your comment to help get more responses, hope you can find something that works well for you and let us know how it goes!