Thanks for the reply rich, what you explained is exactly what I was expecting to happen with TDA though by their indication this is something they currently cannot do.
Can you confirm if you're located in the United States? If not, where are you located? If you are in the US, I'm wondering why it seems the executive order is preventing TDA from performing such actions whereas Fidelity doesn't seem to have that issue as your situation proves.
Since the ordinary shares are not traded on any local exchange, the conversion from ADR shares to ordinary shares would indeed result in you holding shares in the privately held ChinaCache. The fact that Fidelity was able to confirm they will hold these for you is great news for you.
Although once your ADR shares are converted they are technically "worthless" since there will be no market for them post-termination, if you are confident in the BaishanCloud-ChinaCache merger happening, then you should assume the stock has a good chance of being re-listed at some point. In which case, it's value would likely increase.
I would definitely explore Fidelity as an option to transfer my shares to if I could, but after speaking with them it seems like they require a minimum share price of 25 cents for any security you want to transfer to them.