If you don't need cargo capability, Magnum, m2s and electra townie make some step through models that come with rear geared hub motors. Also the usual suspects trek giant specialized (yamaha mids).
Make sure you get disk brakes, rim brakes lose most capability in the rain. I'm happy with cable pull disk brakes. That x-treme catalina looked very attractive with the torque sensing, although it appears to be out of stock. Doesn't come in my size (small).
See this thread for a conversion video :
https://electricbikereview.com/foru...vert-your-bike-to-an-e-bike.33836/post-278262
Also the conversion videos of ebikes.ca
You'll need an electric drill, maybe a 3" grinding wheel on a mandrel to open up the slot. set of drills. vise. Hacksaw. tin snips to make 1" clamps to mount controller, torque arms. Set of allen wrenches. combo wrenches. safety glasses. Klein or Ideal crimp tool for battery connections. If you don't mount a PAS magnet wheel, you don't need a crank puller (I didn't). Flat, round triangle file (nicholson, not harbor freight imitations). Maybe rotary file for drill. Stock of 5 mm or 10-32 SS bolts and elastic stop nuts. (grainger, fastenal, MCSdirect.). Don't order stuff from US pro distributors, there is a UPS loan origination fee ($25). Cross border only with USPS/royal mail.
My bike left with super cargo capacity & bags is a yubabike, small frame for short people like me. Had 136 lb groceries on it 2 weeks ago, 400 lb gross. Similar bikes from envoy mongoose($700), xtracycle,blix packa (24") , kona ute, magnum, radwagon (dd draggy motor), surly (steel HD frame).
Main aerodynamic inhibitor of the package is me, the rider that sits like Mary Poppins on the carrousel. Mother popped a neck disk sitting wrong and I look just like her. The more forwards you ride, the more aero. Head forward riders that aren't afraid of popping their neck disks ride orbea electric bikes.
You'll see my battery is mounted on the front, right in line with my body, and wedge shaped. Between the legs is more popular battery, but I don't like having a LiIon fire hazard under my crotch. Forward battery steers fine even with bike unloaded, whereas people complain about batteries high on a rear deck pulling the bike around when they are pushing it.