Three lickable creams, in 15 g sticks. A 28% of chicken, salmon or tuna, a creamy texture and about 6 kcal per stick. Give them from the hand, from the stick itself or over the ration: what makes them useful is not what they provide but what they get the cat to do.
Complementary snack. Does not replace complete food.

Snack · Chicken 28%
Chicken and crab
Creamy snack with 28% chicken and Alaska crab.

Snack · Salmon 28%
Salmon and prawns
Creamy snack with 28% salmon and prawns.

Snack · Tuna 28%
Tuna and abalone
Creamy snack with 28% tuna and abalone.
A creamy treat solves situations a dry treat cannot.
A newly arrived or rescued cat comes to a smell before it comes to a hand. The stick lets you offer something while keeping the distance the cat chooses, and repeat the scene daily until that distance shrinks by itself.
Half a cream over the dry food changes the smell of the whole bowl. It is a known trick with older cats, who lose their sense of smell, and with cats recovering from something and eating reluctantly.
The creamy texture wraps medication well. Check with the vet, since not every drug can be given with food, but where it can it avoids the struggle and the stress on both sides.
At 88% moisture, each stick is also a small drink. It does not replace water or wet food, but it adds up in an animal that naturally drinks less than it should.