A couple of quick thoughts!
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You might find this thread has interesting ideas. It's about augmenting submissions with audio transcriptions but you'll probably find value in the idea of adding a field that a script then makes relevant. Like I say there, I think augmenting submissions this way is a perfectly valid thing to do if you want Central to be a/the source of truth.
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If you're comfortable using the API, you can shortcut your way to bulk upload with something like this script. This is basically what Central will do itself but we'll also want to do preview, detection of errors in source files, etc, so that's why it's a bigger endeavor to build in. If you haven't already, please be sure to answer our quick poll about bulk upload.