If you arent a mash brewer, arent prepared to use enzymes and find a kit + Dex/Sugar isnt dry enough for you then youre pretty well screwed!
No matter what you add as the balance of your fermentable (the Kilo part of K&K) (both Dex and sugar are 100% fermentable) that wont decrees the body contributed by the malt extract in the kit, there are a couple of kits on the market that are called Dry, several have the enzyme under the lid with the yeast, a couple have it made into the kit. same same, its just enzyme thats been hidden from you.
Take up mash brewing, use enzymes or learn to love what youre brewing.
MHB