Hi @Marco_Leoncino, welcome. I am don’t have specifics on cameras, but would share my experience with DSLRs. The downfall of the DSLR is what you mentioned about the shutter. I’ve used a DSLR successfully and already far exceeded the manufacturers shutter by far. So depending on the amount of film that you need to digitize (in my case it was about 120 reels of 8/S8), that may be an option.
On a similar token, some digital cameras provide full hdmi output, and if 1080 is sufficient resolution, you can capture the HDMI live and not wear the shutter. I am not trying to convince you to use one, but if you already have one, it may do the trick.
I have a very similar setup with Arduino and a stepper, and if you are on Windows, you can also consider using DigicamControl. It has an Arduino plugin that allows you to send commands from the Arduino to the Windows computer to take the shot. What I like about it is if you decide to go with RAW, it will be stored directly in the computer. Similarly, in linux you can use entangle (no serial arduino plugin, but you can use the arduino as a keyboard and trigger the shot (hope this make sense).
This link to the description of the project with additional information.
I am overdue to document some of the changes, will try to clean up the docs. In the mean time, I’ll share info and answer whatever questions you have regarding my setup. Welcome, and you come the right place.