With V1.1, two new engrams have been added to convert kibble that was made before installing the mod.
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Kibble Pasting Bowl - Level 10 - Requires Cooking Pot Engram

Engram Cost: 0
Crafting Requirements: 10 Stone, 3 Thatch

Converts kibble into kibble paste.

giveitem "Blueprint'/Game/Mods/KibbleQOL/ConversionPrep/PrimalItemStructure_ConversionPrep.PrimalItemStructure_ConversionPrep'" 1 1 false
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Kibble Cooking Platter - Level 10 - Kibble Pasting Bowl Engram

Engram Cost: 0
Crafting Requirements: 10 Fiber, 3 Wood

Converts kibble paste into new kibble.

giveitem "Blueprint'/Game/Mods/KibbleQOL/ConversionApply/PrimalItemStructure_ConversionApply.PrimalItemStructure_ConversionApply'" 1 1 false
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I tried to keep the process simple, and added items that wouldn't break immersion. They're also Primitive friendly.

Even though you can convert all old kibble in one go and never need to use the items again, they can also be used for decoration, which is why they have a small resource requirement to craft.

No engram points are required though, as the items do not actually provide any additional functions. They simply take a kibble and give you another back.

The conversion process uses two separate items. This was a workaround as going directly from old kibble to new kibble in one item always caused one kibble to go to waste.

No XP is earned from crafting the paste or kibbles, as you can technically make the paste with the new kibbles too, which would have allowed a loop to get unlimited XP.
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Any questions, just ask (: