Bumped into what I think is a unique app, Photo Renamer – PhotoGadget.
Price: $0. Tolerable ads, at least during my maiden 20 minute usage. Does NOT futz EXIF! Slight bug: insists on applying the current date as the first part of the filename, even after selecting “shooting time.”
Pics tell the story.
Be sure to add a dash ( – ) before your file name. Otherwise, it bumps directly into the date.
Happy Holiday season wishes! 🎉 😀 🎉