As part of Plan B, I arranged for orcmid.com/cgi-bin/mt/ and orcmid.com/mt-static to be implemented as symbolic links to the places where those Movable Type materials are located on the web-hosting GNU/Linux account.
This required access to the account via PuTTY and operating in the command-line shell. The resulting inspection shows the linked directories:
I also confirmed that the linked directories are accessible through their web URLs, http:orcmid.com/mt-static/ and http://orcmid.com/cgi-bin/mt/.
This did not change anything one way or the other, however. The blogs worked as before, and comments are still not functioning on Spanner Wingnut. That's because the Movable Type configuration has not been adjusted to reflect these modifications. I am hoping that is all that is lacking.
To have these new locations be used from pages of blogs implemented on Orcmid's Lair (orcmid.com), I must upload yet-another modified mt-config.cgi file. This one will restore the domain-relative use of the main paths, as follows:

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At last, at last, we have comments on Spanner Wingnut.
There were a number of mis-steps, and you can see them in the above example. The ## comments on the right of mt-config.cgi lines are not recognized as comments. They are treated as part of the parameter when on non-comment lines. That screwed up everything.
I now have no idea what little was needed to get commenting working, since I had mucked that up.