A cycle cape to keep the rain off.
Microfibre cloth to dry the seat on rainy days.
Gloves for warm hands and protection.
Spare inner tube & a few tools.

My daily ride is an Urban Arrow cargobike XL. It's overkill for most people, unless you have a) a large family, or b) a small business, or c) are just mad. Riese & Müller make a great range of ebikes at the premium end of the market. Brompton electric if you're short on space, or Tern are other good choices. I really like the Bosch motor in combination with a Gates belt and Rohloff hub gear for heavy duty work and fuss-free maintenance (based on over 11,000 miles experience).
[I would post a pic if I could work out how to do it!]

My favourite Glenda Jackson film was Hopscotch (1980) with Walter Matthau, Sam Waterston, Ned Beatty, and Herbert Lom.
A Cold War comedy of delicious revenge.