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It's just about a month since Cox updated my Tuning Adapters with the new dual frequency adapters. In the last 30 or so days, it has rebooted twice, for a very short period of time and did not trigger the "tuning adapter not connected" on the TiVo. Other than that, it has worked flawlessly. I would imagine TiVo will be releasing the new adapters sometime in 2023 subject to availability. They have not been in touch with me to see if I have had any issues but did give me the email address of the person in charge of the issue to report any problems which I have yet to have to do.
For those who asked I am in the Phoenix Metro area and the Chandler facility.
I asked the same question on the TIVO Community Forum. A gentleman there provided a link to this thread
https://www.tivocommunity.com/threads/spectrum-and-cable-card.588503/page-15
It shows photos of a replacement Tuning Adaptor used by Charter Communications. It's apparently used in systems that have migrated to a High Split frequency allocation. Not clear if it's suitable for the Mid Split allocation used in Scottsdale. But if they have one for High Split it might be straight forward to build one for Mid Split.