One option is to use software called GeoSetter to apply GPS coordinates from a GPX file you can generate to the pictures (as the coordinates). Lookup GPX format, just change your trackpoints, then use GeoSetter to apply those coordinates to the pictures. Takes some time to figure out the software's quirks (my first time, editing 8 pictures, took 2 hours, I can now change/apply coordinates to 400+ pictures in just under an hour). The beauty is that it is a fully scalable, free solution, and it does a great job for being freeware.
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