It is reasonably easy to get the same results that you seek with the Quarantine and Scrub add-on. Simply Copy Real to Work, then download your metadata from where you wish, then Copy Work back to Real for the specific metadata columns by book for which the Real metadata no longer pleases you and you wish it restored from Work. You can pick and choose by column by book what you keep or restore to the pre-download state.
This is not as easy as an explicit "lock", of course, but it works, and currently exists (unlike the "lock", which does not).
DaltonST
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