When I read you ranting, there are things that I find inconsistent, but that's only my impression of course.
You mention the Fujica Mini, a half frame with fixed focus and only one speed. Even a B setting would not make it a good camera and seen the size it's heavy. There are some many half frames that are much better. There is even a half frame with double exposure, the Lomo LC Wide can do this. If you consider tweaking a camera for double exposure, I would recommend the Agat 18k, good lens, tweakable plastic gear and cheap.
https://www.135compact.com/ half frames are in the second section, after the full frames. And there is the Lomography TIM with B and double exposure
https://www.plastikcam.com/holga_135_tim.htm
If 16mm is your preferred playground, there are so many good and full featured cameras, one of theses can certainly be tricked into double exposure
https://ww w.subcompactcam.com/ last section...
There is always a better camera to imagine. But your journey with film photography should not be full of grief, it should be fun.
Thank you so much for your input, and sorry if I sounded negative! I like your ideas and suggestions.
What I meant is that my film photographic journey is incredibly fun! Sometimes I reach the limits of my gear, and then I am either able to circumvent them with my tinkering skills, or I am not.
I love the portability of the Fujica Mini versus the Lomo Wide, which is why this slight frustration rose. Yes there are other half-frame cameras with lesser lenses and long exposure or double exposure features - usually bulkier - in the realm of 35mm, like the Diana 35, absolutely.
For 35, I tinkered two Kodak Bantam 818 cameras to shoot a quarter frame and full frame on bulk loaded 35mm film. Fixed focus, two speeds (one of the Bantams has a bulb mode, and the other one has a T and normal). So far the 2-perf (quarter frame) Bantam with bulb or normal (plus multiple exposures) is my favorite 35mm camera for experimenting and it is also really small (I also added a 17mm filter thread and add smartphone filters on it and anamorphic).
However I have to load it in the dark, and the focus is only point and shoot. Other than that, it brings me lots of joy (until I reach the end of the roll, every 140 frames shot or so).
I also tinkered a Zenobia to shoot 6x3, 24 frames per roll of medium format, so my needs to have a camera with lots of frames per roll and double exposures and some longer exposure settings are also covered for 120.
It was when I ventured into 16mm photography that my usual habits kicked in after a few test rolls of single exposures: Can I do night photography, can I use manual settings, can I do doubles, etc.
I have a Minolta 16-PS, a Minolta 16-MG, A Minolta-16, a Mamiya 16 Super and a Narciss. All of them are fun especially the ones with manual features. Since I bulk load, the Minolta-16 whose film advance mechanism is operated when you open or close the camera isn't always convenient because when I reach the end of my film with the feeding spool, the camera can get stuck in open position (I like loading a lot more than 20 exposures). I love the results I've shot with them (even though the Narciss has a weird film advance problem), and I was feeling a bit limited in not being able to do doubles in this format.
I like the webpage you shared, however I'm not sure I'd be able to convert a shutter that needs to be cocked (which advances the film) into an everset shutter and separate advance mechanism.
I also like the idea of taking the film out and putting it back in - this is how I do double exposures in the Pentax Auto 110.