An interesting proposition.

All of your blogs must use a code name for the project, and indicate that it is a "Rough Draft / Work In Progress, and that the Final Edited Version will Only Be Available on Kindle Unlimited.

This disclaimer will be sufficient to avoid the problem of previously published works?

Do you receive any affiliate benefits for Scrivener or Kindle Unlimited? If so, please disclose them in your post (and for any other referral/affiliate links).