Allbarone, Drxx -
sorry, but I can't make any kind of pairs out of the 14 answers as specified in the first two sentences of the preamble.
Six of them are
qualifiers for varieties of the pivotal subject;
Eight of them
contain the pivotal subject.
So they're all undeniably thematic individually,
and in two different ways.
- but I really can't see
any way that any combinations of these whole words make meaningful "...thematically linked pairs, four pairs being thematic in one way and three in another."
I'm afraid your explanations don't cast any light on this at all for me.
Maybe I'm being characteristically dense, and can expect a Damascene flash of revelation when the result and (I hope) explanation is published in two weeks time - but as far as I can see the mysterious 'pairing' of these 14 words doesn't contribute anything to the solution of the grid, or to the instructions for the 'artworks' - so perhaps I shouldn't care.
Niggling me, though...