I am interested in the concept of hyper-computation and I would like it to be physically constructable, but in the present moment I also see it as an intellectual construct only.
Thus, I am as sceptical as you. :)
If, someday, super-Turing devices will be built, I imagine it will (first) come as analog devices (e.g. Siegelmann's Analog Neural Networks [1,2]), not as biological ones.
But this discussion is slightly off-topic, I guess.
[1]: https://binds.cs.umass.edu/anna_cp.html
[2]: https://www.researchgate.net/profile/Arthur_Younger2/publica...
Personally, I wouldn't be actually all that surprised if mathematics and computer science ended up solved some day by a system of chemical membranes, since, to put it extremely crudely, it was developed by systems of chemical membranes in the first place ;) That would raise some serious philosophical questions, though.
If some device can solve the Halting Problem, then it can solve every single unsolved mathematical conjecture that can be encoded as a Turing machine that halts if the conjecture is true (so about all of them?). This is an insanely bold claim, so please forgive the scepticism.