"Change Partners" by Araucaria

LORENZO and JESSICA, BENEDICK and BEATRICE, and PETRUCHIO and KATHARINA are clearly well matched in a way that (amongst almost all the others) ANTONY and CLEOPATRA, and DEMETRIUS and HELENA, are not: this could be corrected by a swap - ANTONY and HELENA, DEMETRIUS and CLEOPATRA. Each of ten across clues is a partial clue to two such new partners run together: one of the two (you have to guess which) is to be inserted in the diagram.

Across

1		Party stepped back like a crab (7)
5		Two words for Eldorado named in stage show (7)
9		I've nothing novel in George Eliot's (5)
10		Travel volunteers keep queen on row with beast (9)
11		A lord is ill, frozen drunk (8)
12		Branch having trouble with the home of the golden squirrel (6)
14/25		Sloth, etc., brought farewell to paradise (8)
16		An endless party among the intoxicated - took to moving house (10)
19		Criterion for Austen and Pakistani resort to be slotted together (10)
20		See 5 Down
22		Be proud about wicked word or deed with love (6)
23		Grocer's half swallowed a new ration of salt (8)
26		Invite different races to draw (9)
27		Not genuine sticky stuff? (5)
28		Noise in well comin back like hooter (7)
29		American space station;s conjunction in the water (7)

Down

1		Chap with 3 quarry maybe going off (9)
2		A word for a pet? (5)
3		Gates to follow launching of Pentium soon (6)
4		Make both ends fast - we're in dock (10)
5/20		Pedigree (cat) sounded happy to be turning in (4-4)
6		Push into action in two ways (8)
7		Inner man, a homophone and an anagram, so? (2,1,6)
8		25 after E and I, say? (5)
13		Endangered habitat of minmum frequency without data (4-6)
15		Revolutionary tier? (9)
17		Stranger in orders disbursing gold to old fools (9)
18		With bare hooves - else, hoss is in trouble (8)
21		Spotted the last of the dried fruit (6)
22		A fifth month's encompassing of an island (5)
24		The baby is a girl (5)
25		See 14 Across