No, I have never looked into this. However if you google (for example) "batch replace exif data", you will probably find something that will do it.
Normally I manipulate my files a little in a small editing program (Paint Shop Pro, had it for years and still does most of what I need) and save under a new filename before uploading to wherever. I am not sure whether this maintains the old image data or not, and if not, whether it inserts new values; others may know...
I did have access to Photoshop some years back and seem to recall it had quite extensive batch file-manipulating options such as changing names etc., but don't know about the metadata side of things, sorry.
Best - Tony