To each their own Smellyharry. I do not recall being "given" any such k?????? at any point. Perhaps I missed it. It was my understanding that the solver is meant to obtain it on their own.
It is only my point that without the knowledge of the category, I found well over 100 possible entries for 1A. That is even with the assumption that all down entries will be in Chambers (ie no proper nouns) and 1A is a single word. So the first criteria that must be met does not accomplish much to narrow the scope of searching.
The second criteria also does not help as per my above comment about there being many name candidates in the grid and many potential "creators" per name.
Therefore, there is no clear path to obtain the k?????? in my opinion. One must either get lucky in choosing the right creator, or the right 1A and then use the other to verify.
I agree that it is likely intended to 29 the unnumbered entry. Though I see nothing in the preamble that would be contradicted if this weren't done. Typically this step is prefaced by a "The solver must..." or something similar if it is required for submission.