Yeah if you're not going to rely on metadata, then you have to know what order your camera uses when shooting ... My Panasonic has a setting I like for focus stacking, which shoots in the following order: 0, -1, +1, -2, +2, -3, +3, etc. So my script (it's written in Perl, but could easily be done in ...

You can ask your favorite AI chatbot to create a python script to rename the files for you... I have a script that renames all the files in a directory to put them in the right order. P924345.jpg becomes F001_P924345.jpg etc.