Actually you can do it a long time ago, not so fast as cunoFS, but for the OneDrive/etc. replacement it’s very good - see our guide how to Getting Started with Rclone Configuration - Storj Docs and the rclone mount command to mount a Storj bucket either as a disk letter or as a folder.
However, see
Bootable disk is possible, and cunoFS can help with that, I’m sure, but not sure that you can boot Windows this way.