What you worry about applies to Kindle, Apple and Google. Not Kobo.
Did you miss where I wrote you only need wifi once and there is zero evidence a real email address is misused, and a fake made up email address works.
I'm expert at databases and reasonably expert about security. I'd not attempt to edit the database to pretend it's registered and there is no need.
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Can ExcludeSyncFolders option be useful here?
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No, because once you have "registered" on WiFi once you never need WiFi again. It's not registration like with Apple, Microsoft, Amazon Kindle or Google /Android.
Also unlike others, especially Amazon Kindle, you can load FW manually and go back to earlier FW via USB. It's trival, so it absolutely doesn't matter that with WiFi registration (which doesn't even need a real email address and a real one in 6 years never misused) updates the FW. Simple to afterwards disable WiFi and load older FW via USB
Go
https://pgaskin.net/KoboStuff/kobofirmware.html
Click button at bottom of page
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Versions
All previous versions by hardware revision.
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You are making a mare's nest when there is no need.