This is a sequence of non-sequiturs, none of which respond to my comment. I'll make it easier for you:
Propose a scheme whereby you use AES-CTR to encrypt a 100 megabyte disk of 512-byte sectors, whereby the scheme "rekeys" every "few sectors". Be specific.
Further, every solution is going to have other machinery solving specific concerns.
You don't call XTS something else because you've used scrypt or PBKDF2 as the PBKDF.
Work is work.