Hi Everyone and what an awesome forum!
I've spent the last few days browsing this forum (and the web) for any clues I could find to solve the following
problem:
In the last 6 years I've mainly used the USB connection to transfer non-Amazon Books with Calibre to my Kindle PW 2. Doing so I've always converted them into .AZW3.
Doing this Whisper Sync was never in action or used (since books were not sent by email).
Now I've lost my kindle, but luckily always made backups of myClippings.txt and uploaded that to
https://www.clippings.io/ to edit annotations for book summeries, using Evernote.
I've also made a backup a few months ago of the "documents" folder from my kindle with all the Metadata files in the .SDR folders of each book.
Sidenote: During this search I found out it would have been way smarter to have sent ALL the books over the years via Email to my Kindle Email adress to get access to Whispersync and Sync all books across devices.
My
Question:

Is there a way to convert a Kindle metadata file (in my case .AZW3R) into .MBP or .MBP1 file?
Or extract my annotations and notes from "MyClippings.txt" and convert it into a metadata file (for example .mbp) for each individual book?
The reason is that I would love to send all my books to my used/newly baught Kindle PW 2 via Email in .MOBI format and then copy the .SDR folders with the converted .MBP or MBP1 files manually onto my Kindle.
Would that even work?
Any ideas, solutions or other (possibly simpler) solutions would be more than welcome!