We have added the TinyMCE editor in Quick Edit plus a few nifty features for quickly creating multiple Posts and Pages. We are currently working on adding Post/Page Revisions and Featured Images in Quick Edit too. I believe in time, this can continually be extended.
I believe this development would be a great edition to add to ClassicPress core and I would be happy for you to freely use this code.
You can check out the developments at our website here: https://gutenberg-free.com
Keep up the great work there.