How about a Minox or Olympus XA in prefocus mode? I have made hundreds of good photos with this equipment. At f/5.6 on either one, they're very easy to operate. I especially liked my Minox; would love another one. You can tailor it's operation by choosing the film to suit the light. There are [as you likely well know] great b&w colour negative films [and slides?] from ISO 100 to 800. In the old days, I used Kodachrome 25 in my Minox. I treasure those slides from 30 years ago. It was my favourite for motocross racing photos.
Facetiously, I was going to suggest an M7 with 28mm lens at f/8. A bit smaller than a Rollei SL66.