Yes. They exist. Except for the dotted grid pattern that enables them to be digitized inputs, you can only nuke them five times. From my own personal experience, you don’t need the digitization—99% of what you write on paper is thought-junk you need to perform to work out the valuable ideas.
Label and date every page at the top. Multiple pages on same date get serialized.
The paper + recycling bin wins, no microwave required. $27 for two notebooks becomes $27 for about 1300 sheets of reinforced filler paper out of which you’ll make 13 pages of “gold.” For two microwavable notebooks, you can only grind your mind’s work into 800 sheets—none of which you’ll tear out and archive.