I've shot a no budget feature film (partially) as a DP under similar circumstances last year. we had some permissions here and there to shoot in metros and train stations for a few hours, but mostly it was outside in the busy capital city.
i'll share a still of it here, if somebody wants to see more stills I can DM a link, but at the moment I think it's best it mainly stays private considering the film is not finished yet.
i do kind of think best to push back against the idea of total minimalism, or austerity especially in regards to crew. Other than the director and I, we had a 1AD, a PA, a makeup artist, sound guy, a focus puller, and on some days a grip or a gaffer (on the few moments we weren't just relying on available light). our director was someone who was frankly underexperienced and would generally completely abandon our preproduction plans, change the script all the time and was unwilling to listen to anyone else's suggestions other than the actors, which caused some tension from time to time. having these other people on your side to keep you in line can make this experience a lot more pleasant since it's hard to make films, no matter how small the scope is.
this was shot on a largely rigged up BMCC6K with some SLR Magic primes, and mostly on a cine saddle. I guess we we're pretty lucky with not being bothered by strangers while shooting, other than having some random people staring at the camera in a wide shot.
also the thing with walking around in a medium 2-shot is that it is insanely boring, especially for a visual language. there's a reason that doesn't really happen in WKW's stuff.