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The python script mobidedrm circumvents the encryption on MOBI and AZW ebooks. The result is a DRM-free MOBI ebook, which is readable on the Kindle. I don't know if this on its own allows TTS, but if not you could format shift the MOBI to ePub and then back to MOBI using Calibre. That would definitely remove all TTS flags.
It is most likely trivial to circumvent the TTS flag without otherwise removing the DRM. I base this on Amazon's previous attempt at updating MOBI DRM for the Kindle, but perhaps they tried harder this time. Since Amazon itself says that copyright holders have no basis for objecting to TTS, you might think that they would not go after a TTS flag circumvention tool. However, the author might be best served by maintaining anonymity and posting any such script to a site outside the US. I am not aware of any such tool, and at a minimum its author would need access to Kindle ebooks that had TTS disabled.
A small fraction of Kindle ebooks are in the TOPAZ format, and its DRM has not been circumvented.
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