[ksk-rollover] Architectural reconsideration on ICANN's Root Zone KSK rollover

Hi folks, I followed the discussion in this ML and composed a draft proposal (attached and in my repo) as an input. I will not proceed in IETF but consider to publish it in other form, if you think it is too radical to implement. Any comments on the proposal or edits for my poooor English is welcome. J The link of my repo: https://github.com/songlinjian/Parallel-Root-KSK-Rollover Best regards, Davey