I see this as a non issue since it requires physical access to the key and would require them to know your email or have access to your computer.
That list of people would already be able to access your key any time anyway so they wouldn't need to clone it 🤷🏻♀️
I love my rM2 it's amazing for reading manuals, books, any PDF, drawing quick sketches for 3d prints im working on, note taking, custom template note taking, it lasts me a month without needing to charge it, and on top of all that it runs Linux so I can load whatever custom code I want on it!
I don't know where you were getting this $10,000 figure or your claim that it "can't save anything you write down" but the rM Pro is only $579 which is still cheaper than a lot of tablets on the market and it can infact save what you write down.