I was once very adept at changing 35mm film mid-roll back decades ago. But my priorities changed and I became focused on the visual message of my images, not the tools I used to capture them. I concluded my photos were better if I eliminated film choices so I could focus on content. I work on projects or series and learned to determine up front is they should be color or b&w. Decision eliminated. Then, I focused on one color and one b&w film and learned how to use them. My color choice was always Fujichrome Astia. I learned what you could do with it. My b&w choice was always either Fuji Neopan 400, Tri-X, or HP-5+. They all worked the same for me and I bought 50-100 rolls at a time depending on price. I realized developing could not be a variable because I would sometime shoot dim flat lighting indoors them step outside in bright direct sun for subsequent frames on the same roll. I realized you had to learn what that film would do and use that knowledge to determine exposure. So I eliminated any need to change film mid roll.
Here are two frames, not shot same place, but using same film (HP-5 as I remember) and exact same development (HC-110 Dil H 10 minutes) . Both challenging lighting and not determined by an exposure meter but by knowing how much overexposure and underexposure the film could capture. Then image created in post processing. It is all about knowing how to use your tools, not how many you have. So no need to change film.
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